Artikel Fisika kelas 7 ini akan membahas mengenai konsep energi kinetik, energi potensial, dan energi mekanik dengan contoh kasus sehari-hari, yaitu permainan badminton. Penasaran? Yuk, baca sampai habis!
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Siapa di antara kamu yang suka bermain bulu tangkis? Itu loh, permainan tepok bulu atau kok menggunakan raket? Ya, ya, nama lainnya badminton. Hehehe… Ada yang suka, enggak? Kalau kakak sih, suka banget!
Nah, kamu tahu enggak sih, ternyata dalam permainan badminton, itu ada hubungannya dengan Fisika, loh! Ketika kita bermain badminton, kita akan mengeluarkan energi, yaitu energi kinetik, potensial, dan mekanik.
Di materi Fisika kelas 7 ini, kita akan bahas satu per satu konsep ketiga energi tersebut dengan mengaitkannya ke dalam permainan badminton. Wah, penasaran enggak, gais? Langsung saja kita pelajari bersama-sama, ya!
Pengertian Energi
Coba deh, kakak mau tanya, apa sih energi itu? Ada yang bisa jawab? …
Energi adalah kemampuan suatu benda untuk melakukan usaha. Kok suatu benda bisa punya energi? Suatu benda dikatakan memiliki energi apabila benda tersebut dapat menghasilkan gaya yang bisa melakukan kerja. Contohnya pada permainan badminton, gais.
Seperti yang sudah disebutkan di atas, ada tiga jenis energi yang digunakan dalam permainan badminton, yaitu energi kinetik, energi potensial, dan energi mekanik.
Baca Juga: Pahami Macam-Macam Energi dan Perubahannya, Yuk!
Pengertian Energi Kinetik
Energi kinetik adalah energi yang dimiliki oleh suatu benda bermassa karena geraknya. Dalam permainan badminton, salah satu bentuk energi kinetik adalah energi yang dimiliki shuttlecock saat terbang ke arah lawan.
Contoh Penerapan Energi Kinetik
Selain di permainan badminton, contoh energi kinetik dapat ditemukan pada kehidupan sehari-hari yang lain, seperti:
- Planet yang bergerak mengelilingi matahari.
- Bulan yang bergerak mengelilingi Bumi.
- Kendaraan yang melaju di lintasan lurus.
- Elektron yang bergerak mengelilingi inti.
- Bola yang menggelinding, dsb …
Rumus Energi Kinetik
Nah, energi kinetik dapat dihitung dengan cara:
Contoh Soal:
Sebuah mobil bermasa 2 ton bergerak dengan kecepatan 6 m/s. Berapakah energi kinetik mobil tersebut?
Pembahasan:
Diketahui:
m = 2 ton = 2000 kg (jangan lupa konversikan ke dalam satuan SI!)
v = 6 m/s
Ditanya: EK …?
Jawab: Kita langsung gunakan rumus energi kinetik di atas ya.
Jadi, energi kinetik yang dihasilkan oleh mobil tersebut adalah sebesar 36000 J.
Pengertian Energi Potensial
Energi potensial adalah energi yang dimiliki oleh suatu benda karena ketinggian atau posisinya terhadap titik acuan. Kunci dari energi potensial ini adalah semakin tinggi posisi benda, maka semakin besar juga energi potensialnya.
Nah, dalam permainan badminton, energi potensialnya berupa energi yang dimiliki oleh shuttlecock ketika ada di ketinggian tertentu terhadap titik acuan. Titik acuannya bisa berupa tanah ataupun raket, ya. Jadi, semakin tinggi posisi shuttlecock-nya di udara, maka semakin besar juga energi potensialnya!
Contoh Penerapan Energi Potensial
Contoh energi potensial dalam kasus kehidupan sehari-hari juga ada banyak, loh! Di antaranya:
- Benda yang jatuh ke tanah dari ketinggian tertentu.
- Tali busur/ketapel yang ditarik ke belakang.
- Bola yang menggelinding menuruni lereng.
- Blon penuh udara.
- Ayunan, trampolin, batu baterai, dsb …
Rumus Energi Potensial
Penghitungan energi potensial bisa dicari dengan cara:
Contoh Soal:
Sebuah kok berada di atas ketinggian 3 m dari atas tanah. Jika massa kok tersebut adalah 0,005 kg, dan percepatan gravitasi 10 m/s2, besar energi potensial kok terhadap permukaan tanah adalah …
Pembahasan:
Diketahui:
h = 3 m
m = 0,005 kg
g = 10 m/s2
Ditanya: EP …?
Jawab: Menggunakan rumus energi potensial di atas, didapat perhitungan sebagai berikut:
Jadi, energi potensial kok terhadap permukaan tanah adalah sebesar 0,15 J.
Baca Juga: Belajar Macam-Macam Sifat dan Perubahan Bentuk Zat, Yuk!
Pengertian Energi Mekanik
Energi yang terakhir adalah energi mekanik. Energi mekanik adalah jumlah energi kinetik dan energi potensial dalam suatu benda yang digunakan untuk melakukan usaha. Dengan kata lain, energi dalam suatu benda karena gerakan, atau posisi, atau keduanya.
Contoh dari energi mekanik dalam permainan badminton adalah kegiatan service. Mulai dari pemain memukul bola (mengeluarkan energi kinetik), lalu shuttlecock terbang melambung (energi potensial), sampai kok jatuh ke lapangan lawan.
Contoh Penerapan Energi Mekanik
Tidak hanya dalam olahraga badminton, kegiatan sehari-hari kita juga menggunakan energi mekanik kok. Contoh energi mekanik di kehidupan sehari-hari antara lain:
- Menutup pintu rumah.
- Bermain bola basket.
- Abang-abang ojek yang lagi dorong motor mogok.
- Kincir angin.
- Pembangkit listrik tenaga air, dsb …
Rumus Energi Mekanik
Energi mekanik dapat dicari dengan rumus sebagai berikut:
Misalnya, sebuah bola memiliki energi kinetik (EK) sebesar 10 J dan energi potensial (EP) sebesar 5 J. Maka, besar energi mekaniknya (EM) adalah:
EM = EP + EK
EM = 5 J + 10 J = 15 J.
Nah, yang perlu kamu perhatikan, energi mekanik nilainya akan selalu tetap selama hanya gaya gravitasi yang bekerja pada benda tersebut. Hal ini disebut sebagai Hukum Kekekalan Energi Mekanik. Bingung, enggak?
Oke, sebagai contoh, energi kinetik sebuah benda di titik A sebesar 5 J. Energi potensial sebuah benda di titik A sebesar 2 J. Maka, energi mekanik sebuah benda di titik A akan sebesar 5 J + 2 J = 7 J. Energi mekanik benda tersebut di titik B dan C akan bernilai sama, yaitu sebesar 7 J selama hanya ada gaya gravitasi yang bekerja.
EMA = EMB = EMC
EKA ≠ EKB ≠ EKC
EPA ≠ EPB ≠ EPC
Tapi, bisa jadi energi potensial dan energi kinetik benda tersebut di titik B dan C nilainya berubah. Ingat! yang tetap sama adalah nilai energi mekaniknya saja, ya.
Contoh Soal:
Sebuah kelapa dengan massa 2 kg jatuh bebas di ketinggian 5 m dari titik A ke C. Kecepatan mula-mula kelapa tersebut adalah vA = 0 m/s. Jika jarak dari titik B ke C adalah sebesar 3 m, tentukan energi kinetik buah kelapa tersebut di titik B dan C!
Pembahasan:
Diketahui:
m = 2 kg
vA = 0 m/s
hA = 5 m
hB = 3 m
hC = 0 m
Ditanya: EKB dan EKC …?
Jawab:
Kita cari energi kinetik buah kelapa di titik B dulu ya. Kita bisa gunakan rumus Hukum Kekekalan Energi Mekanik yang sudah dijelaskan di atas tadi. Sehingga,
Diperoleh energi kinetik buah kelapa di titik B yaitu sebesar 40 J.
Nah, supaya kamu semakin paham dengan materi kali ini, coba kerjakan sendiri untuk mencari energi kinetik buah kelapa di titik C nya ya. Kalau sudah ketemu jawabannya, komen di bawah ini!
Baca Juga: Penggolongan Materi secara Fisika: Padat, Cair, dan Gas, Bedanya Apa Ya?
Selesai sudah materi kita kali ini. Jadi, dalam setiap pergerakan kita ketika sedang bermain badminton, akan mengeluarkan tiga macam energi, yaitu energi kinetik, potensial, dan mekanik.
Apakah penjelasan di atas sudah cukup jelas? Kalau ada poin-poin yang belum kamu pahami, kamu bisa belajar lewat ruangbelajar. Selain belajar lebih asik, kamu juga bisa belajar melalui video animasi yang menarik! Cobain, yuk!
Sumber Gambar:
GIF ‘Gold Medal Yes’ [Daring]. Tautan: https://giphy.com/gifs/yes-olympics-yay-3o6nULH3kRmLQW13BC (Diakses pada 10 November 2022)
Artikel ini pertama kali ditulis oleh Zara Larasati pada 31 Agustus 2018, kemudian diperbarui oleh Hani Ammariah pada 19 November 2024.
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<h1 class="content-title">
Konsep Energi Kinetik, Potensial & Mekanik dalam Permainan Badminton | Fisika Kelas 7 </h1>
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<p class="content-author"><a href="https://www.ruangguru.com/blog/author/hani-ammariah" class="">Hani Ammariah</a> </p>
<p class="content-info"><span>November 19, 2024 • </span> <span>6 minutes read</span></p>
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<p><img fetchpriority="high" decoding="async" style="height: auto; max-width: 100%; width: 820px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Bentuk%20Energi%20dalam%20Permainan%20Badminton%20-%20Fisika%207-01.jpg" alt="Konsep Energi Kinetik, Potensial, Mekanik - Fisika Kelas 7" width="820" height="410" /></p>
<blockquote>
<p style="text-align: center;"><em><a style="font-weight: bold;" href="https://www.ruangguru.com/blog/c/fisika/fisika-smp-kelas-7" rel="noopener">Artikel Fisika kelas 7</a> ini akan membahas mengenai konsep energi kinetik, energi potensial, dan energi mekanik dengan contoh kasus sehari-hari, yaitu permainan badminton. Penasaran? Yuk, baca sampai habis!</em></p>
</blockquote>
<div>
<p style="text-align: center;"><em>—</em></p>
<p> </p>
<p style="text-align: justify;">Siapa di antara kamu yang suka bermain bulu tangkis? Itu loh, permainan tepok bulu atau kok menggunakan raket? Ya, ya, nama lainnya badminton. <em>Hehehe</em>… Ada yang suka, enggak? Kalau kakak sih, suka banget!</p>
<p style="text-align: justify;">Nah, kamu tahu enggak sih, ternyata dalam permainan badminton, itu ada hubungannya dengan Fisika, loh! Ketika kita bermain badminton, kita akan mengeluarkan energi, yaitu energi kinetik, potensial, dan mekanik.</p>
<p style="text-align: justify;">Di materi Fisika kelas 7 ini, kita akan bahas satu per satu konsep ketiga energi tersebut dengan mengaitkannya ke dalam permainan badminton. Wah, penasaran enggak, gais? Langsung saja kita pelajari bersama-sama, ya!</p>
<p> </p>
<h2><span style="font-size: 18pt;">Pengertian Energi</span></h2>
<p style="text-align: justify;"><span style="font-weight: normal;">Coba deh, kakak mau tanya, apa sih energi itu? Ada yang bisa jawab? …</span></p>
<p style="text-align: justify;"><strong>Energi adalah kemampuan suatu benda untuk melakukan usaha.</strong> Kok suatu benda bisa punya energi? Suatu benda dikatakan memiliki energi apabila benda tersebut <strong>dapat menghasilkan gaya yang bisa melakukan kerja.</strong> Contohnya pada permainan badminton, gais.</p>
</div>
<p style="text-align: justify;">Seperti yang sudah disebutkan di atas, ada tiga jenis energi yang digunakan dalam permainan badminton, yaitu energi kinetik, energi potensial, dan energi mekanik.</p>
<p style="text-align: justify; font-weight: bold;">Baca Juga: <a href="/blog/konsep-energi-dalam-fisika" rel="noopener">Pahami Macam-Macam Energi dan Perubahannya, Yuk!</a></p>
<p> </p>
<p><img decoding="async" class="aligncenter size-medium" src="https://cdn-web-2.ruangguru.com/landing-pages/assets/2f4c5255-ebbe-4961-ba5a-e16a15b48d19.png" alt="konsep energi kinetik" /></p>
<h2><span style="font-size: 18pt;">Pengertian Energi Kinetik</span></h2>
<p style="text-align: justify;"><span style="font-weight: bold;">Energi kinetik adalah</span> <strong>energi yang dimiliki oleh suatu benda bermassa karena geraknya.</strong> Dalam permainan badminton, salah satu bentuk energi kinetik adalah<strong> energi yang dimiliki </strong><strong><em>shuttlecock</em></strong><strong> saat terbang ke arah lawan. </strong></p>
<p> </p>
<h2><span style="font-size: 18pt;">Contoh Penerapan Energi Kinetik</span></h2>
<p style="text-align: justify;"><span style="font-weight: normal;">Selain di permainan badminton, contoh energi kinetik dapat ditemukan pada kehidupan sehari-hari yang lain, seperti:</span></p>
<ul>
<li style="text-align: justify;"><span style="font-weight: normal;">Planet yang bergerak mengelilingi matahari.</span></li>
<li style="text-align: justify;"><span style="font-weight: normal;">Bulan yang bergerak mengelilingi Bumi.</span></li>
<li style="text-align: justify;"><span style="font-weight: normal;">Kendaraan yang melaju di lintasan lurus.</span></li>
<li style="text-align: justify;"><span style="font-weight: normal;">Elektron yang bergerak mengelilingi inti.</span></li>
<li style="text-align: justify;"><span style="font-weight: normal;">Bola yang menggelinding, dsb …</span></li>
</ul>
<p> </p>
<h2><span style="font-size: 18pt;">Rumus Energi Kinetik</span></h2>
<p style="text-align: justify;">Nah, energi kinetik dapat dihitung dengan cara:</p>
<p style="text-align: justify;"><img decoding="async" style="height: auto; max-width: 100%; width: 600px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Bentuk%20Energi%20dalam%20Permainan%20Badminton%20-%20Fisika%207-04.jpg" alt="Rumus Energi Kinetik - Fisika Kelas 7" width="600" height="400" /></p>
<p> </p>
<p style="text-align: justify; font-weight: bold;">Contoh Soal:</p>
<p style="text-align: justify;">Sebuah mobil bermasa 2 ton bergerak dengan kecepatan 6 m/s. Berapakah energi kinetik mobil tersebut?</p>
<p style="text-align: justify; font-weight: bold;">Pembahasan:</p>
<p style="text-align: justify;">Diketahui:</p>
<p style="text-align: justify;">m = 2 ton = 2000 kg (jangan lupa konversikan ke dalam satuan SI!)</p>
<p style="text-align: justify;">v = 6 m/s</p>
<p style="text-align: justify;">Ditanya: EK …?</p>
<p style="text-align: justify;">Jawab: Kita langsung gunakan rumus energi kinetik di atas ya.</p>
<p style="text-align: justify;"><img decoding="async" style="height: auto; max-width: 100%; width: 200px;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Cara%20menghitung%20energi%20kinetik.png" alt="Cara menghitung energi kinetik" width="200" height="260" /></p>
<p style="text-align: justify;">Jadi, energi kinetik yang dihasilkan oleh mobil tersebut adalah sebesar 36000 J.</p>
<p> </p>
<p><img decoding="async" class="aligncenter size-medium" src="https://cdn-web-2.ruangguru.com/landing-pages/assets/7686c23d-6ce5-47d5-bcc8-d910dbcc7e6e.png" alt="konsep energi potensial" /></p>
<h2><span style="font-size: 18pt;">Pengertian Energi Potensial</span></h2>
<p style="text-align: justify;"><span style="font-weight: bold;">Energi potensial adalah e</span><strong>nergi yang dimiliki oleh suatu benda karena ketinggian atau posisinya terhadap titik acuan. </strong>Kunci dari energi potensial ini adalah <strong>semakin tinggi posisi benda, maka semakin besar juga energi potensialnya</strong>.</p>
<p style="text-align: justify;">Nah, dalam permainan badminton, energi potensialnya berupa energi yang dimiliki oleh <em>shuttlecock</em> ketika ada di ketinggian tertentu terhadap titik acuan. Titik acuannya bisa berupa tanah ataupun raket, ya. Jadi, semakin tinggi posisi <em>shuttlecock-</em>nya di udara, maka semakin besar juga energi potensialnya!</p>
<p> </p>
<h2><span style="font-size: 18pt;">Contoh Penerapan Energi Potensial</span></h2>
<p style="text-align: justify;">Contoh energi potensial dalam kasus kehidupan sehari-hari juga ada banyak, loh! Di antaranya:</p>
<ul>
<li style="text-align: justify;">Benda yang jatuh ke tanah dari ketinggian tertentu.</li>
<li style="text-align: justify;">Tali busur/ketapel yang ditarik ke belakang.</li>
<li style="text-align: justify;">Bola yang menggelinding menuruni lereng.</li>
<li style="text-align: justify;">Blon penuh udara.</li>
<li style="text-align: justify;">Ayunan, trampolin, batu baterai, dsb …</li>
</ul>
<p> </p>
<h2><span style="font-size: 18pt;">Rumus Energi Potensial</span></h2>
<p style="text-align: justify;">Penghitungan energi potensial bisa dicari dengan cara:</p>
<p style="text-align: justify;"><img loading="lazy" decoding="async" style="height: auto; max-width: 100%; width: 600px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Bentuk%20Energi%20dalam%20Permainan%20Badminton%20-%20Fisika%207-05.jpg" alt="Rumus Energi Potensial - Fisika Kelas 7" width="600" height="400" /></p>
<p> </p>
<p style="text-align: justify; font-weight: bold;">Contoh Soal:</p>
<p style="text-align: justify;">Sebuah kok berada di atas ketinggian 3 m dari atas tanah. Jika massa kok tersebut adalah 0,005 kg, dan percepatan gravitasi 10 m/s<sup>2</sup>, besar energi potensial kok terhadap permukaan tanah adalah …</p>
<p style="text-align: justify; font-weight: bold;">Pembahasan:</p>
<p style="text-align: justify;">Diketahui:</p>
<p style="text-align: justify;">h = 3 m</p>
<p style="text-align: justify;">m = 0,005 kg</p>
<p style="text-align: justify;">g = 10 m/s<sup>2</sup></p>
<p style="text-align: justify;">Ditanya: EP …?</p>
<p style="text-align: justify;">Jawab: Menggunakan rumus energi potensial di atas, didapat perhitungan sebagai berikut:</p>
<p style="text-align: justify;"><img loading="lazy" decoding="async" style="height: auto; max-width: 100%; width: 200px;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Cara%20menghitung%20energi%20potensial.png" alt="Cara menghitung energi potensial" width="200" height="152" /></p>
<p style="text-align: justify;">Jadi, energi potensial kok terhadap permukaan tanah adalah sebesar 0,15 J.</p>
<p style="text-align: justify; font-weight: bold;">Baca Juga: <a href="/blog/sifat-dan-perubahan-bentuk-zat" rel="noopener">Belajar Macam-Macam Sifat dan Perubahan Bentuk Zat, Yuk!</a></p>
<p> </p>
<p><img decoding="async" class="aligncenter size-medium" src="https://cdn-web-2.ruangguru.com/landing-pages/assets/37394748-716b-4c13-a87d-21cc4d243061.png" alt="konsep energi mekanik" /></p>
<h2><span style="font-size: 18pt;">Pengertian Energi Mekanik</span></h2>
<p style="text-align: justify;">Energi yang terakhir adalah energi mekanik. <span style="font-weight: bold;">Energi mekanik adalah </span><strong>jumlah energi</strong> <strong>kinetik dan energi potensial dalam suatu benda yang digunakan untuk melakukan usaha. </strong>Dengan kata lain, energi dalam suatu benda karena gerakan, atau posisi, atau keduanya.</p>
<p style="text-align: justify;">Contoh dari energi mekanik dalam permainan badminton adalah kegiatan <em>service. </em>Mulai dari pemain memukul bola (mengeluarkan energi kinetik), lalu <em>shuttlecock </em>terbang melambung (energi potensial), sampai kok jatuh ke lapangan lawan.</p>
<p style="text-align: justify;"><img loading="lazy" decoding="async" style="height: auto; max-width: 100%; width: 600px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Bentuk%20Energi%20dalam%20Permainan%20Badminton%20-%20Fisika%207-08.jpg" alt="Bentuk Energi dalam Permainan Badminton - Fisika 7-08" width="600" height="600" /></p>
<p> </p>
<h2><span style="font-size: 18pt;">Contoh Penerapan Energi Mekanik</span></h2>
<p style="text-align: justify;">Tidak hanya dalam olahraga badminton, kegiatan sehari-hari kita juga menggunakan energi mekanik kok. Contoh energi mekanik di kehidupan sehari-hari antara lain:</p>
<ul>
<li style="text-align: justify;">Menutup pintu rumah.</li>
<li style="text-align: justify;">Bermain bola basket.</li>
<li style="text-align: justify;">Abang-abang ojek yang lagi dorong motor mogok.</li>
<li style="text-align: justify;">Kincir angin.</li>
<li style="text-align: justify;">Pembangkit listrik tenaga air, dsb …</li>
</ul>
<p> </p>
<h2><span style="font-size: 18pt;">Rumus Energi Mekanik</span></h2>
<p style="text-align: justify;">Energi mekanik dapat dicari dengan rumus sebagai berikut:</p>
<p style="text-align: justify;"><img loading="lazy" decoding="async" style="height: auto; max-width: 100%; width: 600px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Bentuk%20Energi%20dalam%20Permainan%20Badminton%20-%20Fisika%207-06.jpg" alt="Rumus Energi Mekanik - Fisika Kelas 7" width="600" height="400" /></p>
<p> </p>
<p style="text-align: justify;">Misalnya, sebuah bola memiliki energi kinetik (EK) sebesar 10 J dan energi potensial (EP) sebesar 5 J. Maka, besar energi mekaniknya (EM) adalah:</p>
<p style="text-align: justify;">EM = EP + EK</p>
<p style="text-align: justify;">EM = 5 J + 10 J = 15 J.</p>
<p style="text-align: justify;">Nah, yang perlu kamu perhatikan, <span style="font-weight: bold;">energi mekanik nilainya akan selalu tetap selama hanya gaya gravitasi yang bekerja pada benda tersebut</span>. Hal ini disebut sebagai Hukum Kekekalan Energi Mekanik. Bingung, enggak?</p>
<p style="text-align: justify;">Oke, sebagai contoh, energi kinetik sebuah benda di titik A sebesar 5 J. Energi potensial sebuah benda di titik A sebesar 2 J. Maka, energi mekanik sebuah benda di titik A akan sebesar 5 J + 2 J = 7 J. Energi mekanik benda tersebut di titik B dan C akan bernilai sama, yaitu sebesar 7 J selama hanya ada gaya gravitasi yang bekerja.</p>
<p style="text-align: justify;"><img loading="lazy" decoding="async" style="height: auto; max-width: 100%; width: 140px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Ilustrasi%20konsep%20hukum%20kekekalan%20energi%20mekanik.png" alt="Ilustrasi konsep hukum kekekalan energi mekanik" width="140" height="238" /></p>
<p style="text-align: center;">EM<sub>A</sub> = EM<sub>B</sub> = EM<sub>C</sub></p>
<p style="text-align: center;">EK<sub>A</sub> ≠ EK<sub>B</sub> ≠ EK<sub>C</sub></p>
<p style="text-align: center;">EP<sub>A</sub> ≠ EP<sub>B</sub> ≠ EP<sub>C</sub></p>
<p> </p>
<p style="text-align: justify;">Tapi, bisa jadi energi potensial dan energi kinetik benda tersebut di titik B dan C nilainya berubah. Ingat! yang tetap sama adalah nilai energi mekaniknya saja, ya.</p>
<p style="text-align: justify;"><img loading="lazy" decoding="async" style="height: auto; max-width: 100%; width: 600px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Bentuk%20Energi%20dalam%20Permainan%20Badminton%20-%20Fisika%207-07.jpg" alt="Rumus Kekekalan Energi Mekanik - Fisika Kelas 7" width="600" height="600" /></p>
<p> </p>
<p style="text-align: justify; font-weight: bold;">Contoh Soal:</p>
<p style="text-align: justify;">Sebuah kelapa dengan massa 2 kg jatuh bebas di ketinggian 5 m dari titik A ke C. Kecepatan mula-mula kelapa tersebut adalah v<sub>A</sub> = 0 m/s. Jika jarak dari titik B ke C adalah sebesar 3 m, tentukan energi kinetik buah kelapa tersebut di titik B dan C!</p>
<p style="text-align: justify; font-weight: bold;">Pembahasan:</p>
<p style="text-align: justify;">Diketahui:</p>
<p style="text-align: justify;">m = 2 kg</p>
<p style="text-align: justify;"><span style="font-size: 16px;">v</span><sub>A</sub> = 0 m/s</p>
<p style="text-align: justify;"><span style="font-size: 16px;">h</span><sub>A</sub> = 5 m</p>
<p style="text-align: justify;"><span style="font-size: 16px;">h<sub>B</sub></span> = 3 m</p>
<p style="text-align: justify;"><span style="font-size: 16px;">h</span><sub>C</sub> = 0 m</p>
<p style="text-align: justify;">Ditanya: EK<sub>B</sub> dan EK<sub>C</sub> …?</p>
<p style="text-align: justify;">Jawab:</p>
<p style="text-align: justify;">Kita cari energi kinetik buah kelapa di titik B dulu ya. Kita bisa gunakan rumus Hukum Kekekalan Energi Mekanik yang sudah dijelaskan di atas tadi. Sehingga,</p>
<p style="text-align: justify;"><img loading="lazy" decoding="async" style="height: auto; max-width: 100%; width: 540px; margin-left: auto; margin-right: auto; display: block;" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Cara%20menghitung%20energi%20mekanik%20-%20rumus%20hukum%20kekekalan%20energi%20mekanik.png" alt="Cara menghitung energi mekanik - rumus hukum kekekalan energi mekanik" width="540" height="363" /></p>
<p style="text-align: justify;">Diperoleh energi kinetik buah kelapa di titik B yaitu sebesar 40 J.</p>
<p style="text-align: justify;">Nah, supaya kamu semakin paham dengan materi kali ini, coba kerjakan sendiri untuk mencari energi kinetik buah kelapa di titik C nya ya. Kalau sudah ketemu jawabannya, komen di bawah ini!</p>
<p style="text-align: justify; font-weight: bold;">Baca Juga: <a href="/blog/penggolongan-materi-secara-fisika-padat-cair-dan-gas" rel="noopener">Penggolongan Materi secara Fisika: Padat, Cair, dan Gas, Bedanya Apa Ya?</a></p>
<p style="text-align: justify;">Selesai sudah materi kita kali ini. Jadi, dalam setiap pergerakan kita ketika sedang bermain badminton, akan mengeluarkan tiga macam energi, yaitu energi kinetik, potensial, dan mekanik.</p>
<p style="text-align: justify;">Apakah penjelasan di atas sudah cukup jelas? Kalau ada poin-poin yang belum kamu pahami, kamu bisa belajar lewat <strong><a href="https://ruangguru.onelink.me/blPk/eaff0eb9" target="_blank" rel="noopener">ruangbelajar</a>.</strong> Selain belajar lebih<em> asik, </em>kamu juga bisa belajar melalui video animasi yang menarik! Cobain, yuk!</p>
<p style="text-align: center;"><a class="rg-cta" style="text-align: center;" href="https://link.ruangguru.com/blPk/eaff0eb9" target="_blank" rel="noopener"><img loading="lazy" decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/cta/0ec4a2df-db2e-4ae1-8473-692756dcb684.jpeg" alt="IDN CTA Blog ruangbelajar Ruangguru" width="822" height="200" /></a></p>
<p style="text-align: left; font-weight: bold;">Sumber Gambar:</p>
<p style="text-align: left;">GIF ‘Gold Medal Yes’ [Daring]. Tautan: https://giphy.com/gifs/yes-olympics-yay-3o6nULH3kRmLQW13BC (Diakses pada 10 November 2022)</p>
<p style="text-align: left;"><em>Artikel ini pertama kali ditulis oleh Zara Larasati pada 31 Agustus 2018, kemudian diperbarui oleh Hani Ammariah pada 19 November 2024.</em></p>
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<li><a href="https://www.ruangguru.com/privacy-policy">Kebijakan Privasi</a></li>
<li><a href="https://www.ruangguru.com/about-us">Tentang Kami</a></li>
<li><a href="https://www.ruangguru.com/contact-us">Kontak Kami</a></li>
<li><a href="https://www.ruangguru.com/press">Press Kit</a></li>
<li><a href="https://www.ruangguru.com/bantuan">Bantuan</a></li>
<li><a href="https://career.ruangguru.com/">Karier</a></li>
</ul>
</nav>
</div>
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<nav class="footer-menu">
<p class="title">Produk Lainnya</p>
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</div>
<div class="col-6 col-md-3">
<nav class="footer-menu">
<p class="title"> Coba GRATIS Aplikasi Ruangguru</p>
<div class="download-list">
<ul>
<li>
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</a>
</li>
<li>
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<img src="https://cdn-web-2.ruangguru.com/static/googleplay.png" loading="lazy" alt="Button Google Play Footer " />
</a>
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<img src="https://cdn-web-2.ruangguru.com/static/huawei.png" loading="lazy" alt="Button AppGallery Footer " />
</a>
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<div class="d-lg-none text-center">
<nav class="footer-menu social">
<p class="title">Ikuti Kami</p>
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<picture>
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<img src="https://cdn-web-2.ruangguru.com/static/instagram.png" loading="lazy" alt="Logo Instagram Footer" width="32px" height="32px" />
</picture>
</a>
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<picture>
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</a>
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</picture>
</a>
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</div>
<p class="footer-copyright">
© 2026 All Rights Reserved PT. Ruang Raya Indonesia
</p>
</div>
<style>
.bantuan-container {
position: relative;
}
.bantuan-element {
position: fixed;
z-index: 999;
display: flex;
align-items: flex-end;
justify-content: flex-end;
cursor: pointer;
transition: all 0.6s ease;
}
.bantuan-top {
bottom: 11rem;
right: 2rem;
}
.bantuan-bottom {
bottom: 2rem;
right: 2rem;
}
.bantuan-top-2 {
bottom: 15rem;
right: 2rem;
}
.bantuan-top-3 {
bottom: 19rem;
right: 2rem;
}
.bantuan-bottom-2 {
bottom: 5rem;
right: 2rem;
}
.bantuan-bottom-3 {
bottom: 8rem;
right: 2rem;
}
@media (min-width: 768px) {
.bantuan-element img {
width: auto;
transition: all 0.4s ease;
}
.bantuan-top img {
width: 140px;
}
.bantuan-bottom img {
width: 140px;
}
.bantuan-top-2 img,
.bantuan-top-3 img {
width: 140px;
}
.bantuan-bottom-2 img,
.bantuan-bottom-3 img {
width: 140px;
}
.bantuan-element.clicked {
bottom: 9rem;
right: 2.5rem;
}
.bantuan-element.clicked img {
width: auto;
height: 64px;
}
}
@media (max-width: 767px) {
.bantuan-top {
bottom: 8rem;
right: 1rem;
align-items: center;
}
.bantuan-bottom {
bottom: 2rem;
right: 1.25rem;
align-items: center;
}
.bantuan-top-2 {
bottom: 12rem;
right: 1rem;
align-items: center;
}
.bantuan-top-3 {
bottom: 16rem;
right: 1rem;
align-items: center;
}
.bantuan-bottom-2 {
bottom: 5rem;
right: 1.25rem;
align-items: center;
}
.bantuan-bottom-3 {
bottom: 8rem;
right: 1.25rem;
align-items: center;
}
.bantuan-element img {
width: auto;
}
.bantuan-top img,
.bantuan-top-2 img,
.bantuan-top-3 img {
width: 96px;
}
.bantuan-bottom img,
.bantuan-bottom-2 img,
.bantuan-bottom-3 img {
width: 96px;
}
}
.bantuan-element:hover {
transform: scale(1.05);
}
.bantuan-element img {
max-width: 100%;
height: auto;
}
</style>
<div id="bantuan-divs-container" style="position: relative" data-product="ruangguru" data-table="rg_floating_icon"></div>
<script>
class FloatingDivsComponent {
constructor(product = 'ruangguru', table = 'rg_floating_icon') {
this.container = document.getElementById('bantuan-divs-container');
this.floatingElements = [];
this.product = product;
this.table = table;
// Configuration
this.config = {
baseApiUrl: 'https://gw.ruangguru.com/api/v3/rdb/p_ddgy8hjx5dxsqx/rg_banner/views/',
apiKey: 'vLyK3dJrDBRmOwueX2OJXibMkgsUbBk0WS4ua2p1',
maxElements: 2,
zIndexBase: 100,
};
// Build dynamic API URL based on table parameter
this.config.apiUrl = this.buildApiUrl();
this.init();
}
buildApiUrl() {
const baseUrl = this.config.baseApiUrl;
const tableName = this.table || 'rg_floating_icon';
const queryParams =
'offset=0&limit=99999&sort=rankPosition&where=(type,eq,floating)~and(showIn,anyof,blog)~and(hide,is,false)~and(product,eq,' +
this.product +
')&nested%5Bcta%5D%5Bfields%5D=Id,name,ctaId,imageUrl,ctaLink,targetUrl';
return `${baseUrl}${tableName}?${queryParams}`;
}
async init() {
try {
await this.fetchFloatingElements();
this.renderFloatingElements();
} catch (error) {
console.error('Failed to initialize floating divs component:', error);
}
}
async fetchFloatingElements() {
try {
const options = {
method: 'GET',
headers: {
'xc-token': this.config.apiKey || 'vLyK3dJrDBRmOwueX2OJXibMkgsUbBk0WS4ua2p1',
},
};
const urlNoco = this.config.apiUrl;
const response = await fetch(urlNoco, options);
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const data = await response.json();
this.floatingElements = this.processApiResponse(data);
} catch (error) {
console.error('Error fetching floating elements:', error);
throw error;
}
}
processApiResponse(data) {
if (!data || !data.list || !Array.isArray(data.list)) {
return [];
}
console.log(data.list);
// Ensure we only get maximum 2 elements
const limitedElements = data.list.slice(0, this.config.maxElements);
return limitedElements;
}
renderFloatingElements() {
if (!this.container || this.floatingElements.length === 0) {
return;
}
// Additional safeguard: ensure we never render more than maxElements
const elementsToRender = this.floatingElements.slice(0, this.config.maxElements);
// Clean up existing elements and their event listeners
this.cleanupExistingElements();
// Clear existing content
this.container.innerHTML = '';
elementsToRender.forEach((element, index) => {
const floatingDiv = this.createFloatingDiv(element, index);
this.container.appendChild(floatingDiv);
});
}
cleanupExistingElements() {
// Clear existing elements (no need for event listener cleanup with CSS approach)
const existingElements = this.container.querySelectorAll('[data-floating-element]');
existingElements.forEach(element => {
element.remove();
});
}
createFloatingDiv(element, index) {
const div = document.createElement('div');
const cta = element.cta[0]; // Use the first CTA
// Add data attribute for cleanup tracking
div.setAttribute('data-floating-element', 'true');
// Apply CSS classes based on rankPosition
const positionClass = this.getPositionClass(element.rankPosition, index);
div.className = `bantuan-element ${positionClass}`;
div.style.zIndex = this.config.zIndexBase + index;
// Create the link and image
const link = document.createElement('a');
link.href = 'https://cta.ruangguru.com/' + cta.ctaId || '#';
link.target = '_blank';
// Add tracking attributes
link.setAttribute('data-tracking-event-type', 'landing_page__core__item_click');
link.setAttribute(
'data-tracking-context',
JSON.stringify({
product_name: this.product,
cta_action: 'redirection',
cta_action_detail: link.href,
item_type: 'floating',
item_name: element.name || 'Floating element',
item_category: 'payment',
item_position: index,
item_serial: null,
section_type: 'floating_item',
section_position: 'body',
section_name: 'floating_item',
})
);
const img = document.createElement('img');
img.src = element.imageUrl + '?h=200&convert=webp';
img.alt = element.name || 'Floating element';
img.loading = 'lazy';
// Add click tracking
link.addEventListener('click', () => {
this.trackClick(element, cta);
});
link.appendChild(img);
div.appendChild(link);
return div;
}
getPositionClass(rankPosition, index) {
// Define positioning classes based on rankPosition
if (rankPosition === 1) {
return 'bantuan-top'; // Top position
} else if (rankPosition === 2) {
return 'bantuan-bottom'; // Bottom position
} else {
// For additional elements, distribute them evenly
return `bantuan-${index % 2 === 0 ? 'top' : 'bottom'}-${Math.floor(index / 2) + 1}`;
}
}
trackClick(element, cta) {
// Implement click tracking logic here
console.log('Floating element clicked:', {
elementId: element.Id,
elementName: cta.name,
ctaId: cta.ctaId,
targetUrl: cta.targetUrl,
});
}
// Public method to manually refresh
async refresh() {
try {
await this.fetchFloatingElements();
this.renderFloatingElements();
} catch (error) {
console.error('Failed to refresh floating elements:', error);
throw error;
}
}
// Public method to get current floating elements
getFloatingElements() {
return [...this.floatingElements];
}
}
// Initialize the component when DOM is ready
document.addEventListener('DOMContentLoaded', () => {
// Get product and table parameters from data attributes
const container = document.getElementById('bantuan-divs-container');
const product = container.getAttribute('data-product') || 'ruangguru';
const table = container.getAttribute('data-table') || 'rg_floating_icon';
new FloatingDivsComponent(product, table);
});
// Export for use in other modules if needed
if (typeof module !== 'undefined' && module.exports) {
module.exports = FloatingDivsComponent;
}
</script> <div id="wp-install-nudge" style="
position: fixed;
bottom: 0rem;
right: 0;
z-index: 999;
cursor: pointer;
"></div>
<script>
(function (w, d, s, o, f, js, fjs) {
w['Sales-Nudge-Widget'] = o; w[o] = w[o] || function () { (w[o].q = w[o].q || []).push(arguments) };
js = d.createElement(s), fjs = d.getElementsByTagName(s)[0];
js.id = o; js.src = f; js.async = 1; fjs.parentNode.insertBefore(js, fjs);
}(window, document, 'script', 'wpInstallNudge', 'https://cdn-web-2.ruangguru.com/sales-nudge/6198a95130/dist/widget.js'));
wpInstallNudge('init', { targetElementId: 'wp-install-nudge', clientTarget: 'ruangguru_blog' });
</script>
<script>
// note: disabled due to auto reload page
// var lastScrollTop = 0;
// $(window).scroll(function(event){
// var st = $(this).scrollTop();
// if (st > lastScrollTop){
// $('#wp-install-nudge').slideDown( "slow", function() {});
// } else {
// $('#wp-install-nudge').slideUp( "slow", function() {});
// }
// lastScrollTop = st;
// });
// $(document).ready(function () {
// $("#wp-install-nudge").hide();
// });
$('#wp-install-nudge').click(function(){
Analytics.track("promotion__install_nudge__click",
{
user_email: "ruangguru@blog.com",
cta_link: widgetData.dataConfig.target_link
}).catch((err) => {
console.log("tracker error", err);
});
});
</script>
</footer>
<div id="__next"></div>
<script type="speculationrules">
{"prefetch":[{"source":"document","where":{"and":[{"href_matches":"\/blog\/*"},{"not":{"href_matches":["\/blog\/wp-*.php","\/blog\/wp-admin\/*","\/blog\/wp-content\/uploads\/*","\/blog\/wp-content\/*","\/blog\/wp-content\/plugins\/*","\/blog\/wp-content\/themes\/ruangguru\/*","\/blog\/*\\?(.+)"]}},{"not":{"selector_matches":"a[rel~=\"nofollow\"]"}},{"not":{"selector_matches":".no-prefetch, .no-prefetch a"}}]},"eagerness":"conservative"}]}
</script>
<script>
async function getCtaDetails(ctaIds) {
const endpoint =
" https://gw.ruangguru.com/api/v3/rdb/p_ddgy8hjx5dxsqx/CTA/views/CTA?offset=0&limit=10&where=(ctaId,in," + ctaIds.toString() + ")";
try {
const response = await fetch(endpoint, {
headers: {
"xc-token": "-hG2nBDJzSj0agSgNtcJx97M4F02y54nUMoY6plJ",
},
});
const data = await response.json();
const ctaList = data?.list || [];
const ctaMap = new Map();
for (const ctaData of ctaList) {
ctaMap.set(ctaData.ctaId, ctaData);
}
return ctaMap;
} catch (error) {
console.error("Error fetching CTA details:", error);
return new Map();
}
}
async function replaceCTA() {
const regex = /{{cta\((‘(.*?)’|“(.*?)”)\)}}/g;
const bodyHTML = document.body.innerHTML;
const matches = Array.from(bodyHTML.matchAll(regex));
const ctaIds = matches.map((match) => {
let ctaId = match[2] ?? match[3];
return ctaId;
});
const ctaMap = await getCtaDetails(ctaIds);
const replacedHTML = bodyHTML.replace(regex, (match, _inner, ctaId1, ctaId2) => {
const ctaId = ctaId1 ?? ctaId2;
const ctaData = ctaMap.get(ctaId);
if (ctaData) {
return `<a href="https://cta.ruangguru.com/${ctaData.ctaId}" target="_${ctaData.targetType}" style="position:relative;display:inline-block;">
<img src="${ctaData.imageUrl}" loading="lazy" alt="${ctaData.altText}" />
</a>`;
} else {
return match;
}
});
document.body.innerHTML = replacedHTML;
}
</script>
<meta name="author" content="Ruangguru Tech Team">
<!-- Google Tag Manager (noscript) -->
<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-PVNLZFT" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<!-- Tracker -->
<script type="text/javascript" src="https://cdn-web-2.ruangguru.com/landing-page-web/public/staticpages/global-assets/js/cta.js"></script>
<script src="https://unpkg.com/@dotlottie/player-component@latest/dist/dotlottie-player.mjs" type="module"></script>
</body>
</html>