{"id":314792,"date":"2023-03-20T09:38:50","date_gmt":"2023-03-20T02:38:50","guid":{"rendered":"https:\/\/quipperhome.wpcomstaging.com\/?p=314792"},"modified":"2023-03-20T09:39:43","modified_gmt":"2023-03-20T02:39:43","slug":"energi-kinetik","status":"publish","type":"post","link":"https:\/\/quipperhome.wpcomstaging.com\/mapel\/fisika\/energi-kinetik\/","title":{"rendered":"Pengertian Energi Kinetik, Manfaat, Rumus dan Contoh Soalnya"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

Hai Quipperian, saat kamu mengendarai sepeda lalu kamu melakukan pengereman secara mendadak, biasanya akan terdengar bunyi gesekan antara as roda dengan jalan kan? Namun, jika sepeda itu dalam kondisi diam lalu kamu rem, apakah akan muncul bunyi gesekan juga? Tentu tidak, ya. Lantas, apa yang menyebabkan terjadinya bunyi gesekan itu? Sepeda yang bergerak memiliki suatu energi yang disebut energi kinetik. Nah, proses pengereman yang kamu lakukan akan mengubah energi kinetik itu menjadi energi bunyi dan panas. Memangnya, apa yang dimaksud energi kinetik itu? Daripada penasaran, yuk simak selengkapnya!<\/p>\n\n\n\n

Pengertian Energi Kinetik<\/strong><\/h2>\n\n\n\n

Energi kinetik adalah energi yang dimiliki benda karena kecepatannya. Itu artinya, benda yang diam tidak memiliki energi kinetik. Besarnya energi kinetik berbanding lurus dengan massa dan kecepatan. Semakin besar massa dan kecepatan benda, semakin besar pula energi kinetiknya. Misalnya, becak dan mobil bergerak dengan kecepatan yang sama. Menurut Quipperian, mana yang memiliki energi kinetik lebih besar? Tentu mobil ya, karena massa mobil pasti jauh lebih besar daripada becak.<\/p>\n\n\n\n

Rumus Energi Kinetik<\/strong><\/h2>\n\n\n\n

Berdasarkan jenis geraknya, energi kinetik dibagi menjadi dua, yaitu energi kinetik translasi dan energi kinetik rotasi. Apa perbedaan antara kedua energi tersebut?<\/p>\n\n\n\n

Rumus Energi Kinetik Translasi<\/strong><\/h3>\n\n\n\n

Energi kinetik translasi adalah energi kinetik yang dimiliki oleh benda yang bergerak translasi, contohnya gerakan meja, gerakan kamu berjalan, gerakan semut berjalan, dan sebagainya. Mudahnya, translasi itu gerakan selain rotasi. Secara matematis, rumus energi kinetik translasi dinyatakan sebagai berikut.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Dengan:<\/p>\n\n\n\n

Ek<\/em> = energi kinetik (J);<\/p>\n\n\n\n

m<\/em> = massa benda (kg); dan<\/p>\n\n\n\n

v<\/em> = kecepatan benda (m\/s).<\/p>\n\n\n\n

Perhatikan contoh berikut.<\/p>\n\n\n\n

Sebuah minibus bermassa 350 kg bergerak dengan kecepatan 72 km\/jam. Berapakah energi kinetik minibus tersebut?<\/p>\n\n\n\n

Pembahasan:<\/p>\n\n\n\n

Diketahui:<\/p>\n\n\n\n

m<\/em> = 350 kg<\/p>\n\n\n\n

v<\/em> = 72 km\/jam = 20 m\/s<\/p>\n\n\n\n

Ditanya: Ek<\/em> =\u2026?<\/p>\n\n\n\n

Jawab:<\/p>\n\n\n\n

Energi kinetik minibus dirumuskan sebagai berikut.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Jadi, energi kinetik minibus tersebut adalah 70 kN.<\/p>\n\n\n\n

Rumus Energi Kinetik Rotasi<\/strong><\/h3>\n\n\n\n

Energi kinetik rotasi adalah energi kinetik yang dimiliki oleh benda yang berputar terhadap sumbu tertentu. Contohnya, gerakan baling-baling kipas angin, gerak putaran roda saat sepeda didiamkan, gerak jarum jam, dan sebagainya. Secara matematis, rumus energi kinetik rotasi dinyatakan sebagai berikut.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Dengan:<\/p>\n\n\n\n

Ek<\/em>rot<\/sub><\/em> = energi kinetik rotasi (J);<\/p>\n\n\n\n

I<\/em> = momen inersia benda (kg.m2<\/sup>); dan<\/p>\n\n\n\n

\u03c9 = kecepatan sudut (rad\/s).<\/p>\n\n\n\n

Rumus Hubungan antara Perubahan Energi Kinetik dan Usaha<\/strong><\/h3>\n\n\n\n

Usaha merupakan suatu besaran yang menyatakan besarnya gaya yang bekerja pada benda pada lintasan tertentu. Secara matematis, dirumuskan sebagai W<\/em> = Fs<\/em>.<\/p>\n\n\n\n

Ternyata, definisi usaha tidak terbatas pada pengertian di atas, ya. Usaha juga bisa didefinisikan sebagai perubahan energi kinetik, lho<\/em>. Misalnya, kamu mengendarai mobil dengan kelajuan tetap, yakni 30 m\/s. Lalu, kamu menurunkan kecepatanmu menjadi 15 m\/s. Selisih antara energi kinetik saat kamu bergerak dengan kecepatan 30 m\/s dan 15 m\/s itu juga disebut sebagai usaha total. Secara matematis, rumus hubungan antara perubahan energi kinetik dan usaha adalah sebagai berikut.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Dengan:<\/p>\n\n\n\n

Ek<\/em>1<\/sub><\/em> <\/em>= energi kinetik mula-mula (J); <\/p>\n\n\n\n

Ek<\/em>2<\/sub><\/em> = energi kinetik akhir (J); dan<\/p>\n\n\n\n

W<\/em> = usaha (J).<\/p>\n\n\n\n

\n

Baca Juga: <\/span> Pengertian Gaya Magnet, Sifat dan Contoh dalam Kehidupan Sehari-hari<\/a><\/p>\n<\/div>\n\n\n\n

Manfaat Energi Kinetik dalam Kehidupan<\/strong><\/h2>\n\n\n\n

Dalam kehidupan sehari-hari, energi kinetik bermanfaat untuk hal-hal berikut.<\/p>\n\n\n\n

Energi Panas Memanfaatkan Energi Kinetik Atom<\/strong><\/h3>\n\n\n\n

Pernahkah kamu menggosok-gosokkan suatu benda di dinding atau meja? Semakin cepat kamu menggosoknya, pasti semakin terasa panas benda tersebut. Hal itu terjadi lantaran atom-atom di dalam benda yang digosok itu akan bergerak semakin cepat. Akibatnya, akan muncul energi panas.<\/p>\n\n\n\n

 Energi Putaran Baling-Baling<\/strong><\/h3>\n\n\n\n

Tentu Quipperian pernah menggunakan kipas angin, kan? Putaran baling-baling pada kipas, akan menggerakkan udara di sekitarnya. Udara yang bergerak itu memiliki energi kinetik. Semakin cepat gerakan udaranya, semakin besar energi kinetik yang dihasilkan.<\/p>\n\n\n\n

Gerakan Bola<\/strong><\/h3>\n\n\n\n

Siapa di antara Quipperian yang hobi bermain atau menonton sepak bola? Bola yang ditendang akan menghasilkan energi kinetik. Semakin kuat tendangan bolanya, semakin cepat gerakan bola tersebut. Itu artinya, energi kinetik bola akan semakin besar. Apa akibatnya jika energi kinetik bola semakin besar?<\/p>\n\n\n\n

Jika seorang atlet menendang bola di depan gawang dengan kecepatan tinggi, pasti bola tersebut akan melesat dengan kuat dan sulit untuk ditangkap oleh penjaga gawang. Berbeda halnya jika tendang bolanya pelan, pasti bola mudah ditangkap oleh penjaga gawang.<\/p>\n\n\n\n

Pembangkit Listrik Tenaga Air<\/strong><\/h3>\n\n\n\n

Pembangkit listrik tenaga air memanfaatkan energi kinetik air untuk menggerakkan turbin generator. Dari gerakan turbin itulah akan dihasilkan energi listrik. Selanjutnya, energi listrik akan ditransmisikan ke rumah-rumah penduduk.<\/p>\n\n\n\n

Contoh Soal<\/strong><\/h2>\n\n\n\n

Untuk mengasah pemahamanmu tentang energi kinetik, yuk simak contoh soal berikut ini.<\/p>\n\n\n\n

Contoh Soal 1<\/strong><\/h3>\n\n\n\n

Seekor kijang bermassa 35 kg mula-mula diam. Lalu, kijang tersebut melihat seekor harimau menghampirinya. Karena takut, kijang tersebut lari dengan percepatan 1,5 m\/s2<\/sup>. Tentukan energi kinetik kijang tersebut setelah berlari selama 5 s!<\/p>\n\n\n\n

Pembahasan:<\/p>\n\n\n\n

Diketahui:<\/p>\n\n\n\n

a<\/em> = 1,5 m\/s2<\/sup><\/p>\n\n\n\n

t<\/em> = 5 s<\/p>\n\n\n\n

v<\/em>0<\/sub> = 0 (diam)<\/p>\n\n\n\n

m<\/em> = 35 kg<\/p>\n\n\n\n

Ditanya: Ek =\u2026?<\/p>\n\n\n\n

Pembahasan:<\/p>\n\n\n\n

Mula-mula, kamu harus tahu dulu kecepatan akhir kijang tersebut. Gunakan persamaan kecepatan pada GLBB dipercepat seperti berikut ini.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Selanjutnya, substitusikan nilai v<\/em>t<\/sub> tersebut pada persamaan energi kinetik.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Jadi, energi kinetik kijang tersebut adalah 984,375 J.<\/p>\n\n\n\n

Contoh Soal 2<\/strong><\/h3>\n\n\n\n

Sebuah batu bermassa 20 gr dilemparkan dengan kecepatan awal 10 m\/s. Setelah bergerak selama 5 s, kecepatan benda bertambah menjadi 12 m\/s. Tentukan usaha benda tersebut!<\/p>\n\n\n\n

Pembahasan:<\/p>\n\n\n\n

Diketahui:<\/p>\n\n\n\n

m<\/em> = 20 gr = 0,02 kg<\/p>\n\n\n\n

v<\/em>1 <\/sub>= 10 m\/s<\/p>\n\n\n\n

v<\/em>2<\/sub> = 12 m\/s<\/p>\n\n\n\n

Ditanya: W<\/em> =\u2026?<\/p>\n\n\n\n

Jawab:<\/p>\n\n\n\n

Usaha bisa ditentukan dari perubahan energi kinetik benda seperti berikut.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Jadi, batu tersebut mengalami usaha sebesar 0,44 J.<\/p>\n\n\n\n

Contoh Soal 3<\/strong><\/h3>\n\n\n\n

Sebuah bola pejal bermassa 2 kg berputar dengan kecepatan sudut 2 rad\/s. Jika jari-jari bola pejal tersebut 15 cm, tentukan energi kinetik rotasi bola pejal tersebut!<\/p>\n\n\n\n

Pembahasan:<\/p>\n\n\n\n

Diketahui:<\/p>\n\n\n\n

m<\/em> = 2 kg<\/p>\n\n\n\n

R<\/em> = 15 cm = 0,15 m<\/p>\n\n\n\n

\u03c9 = 2 rad\/s<\/p>\n\n\n\n

Ditanya: Ekrot<\/sub> =\u2026?<\/p>\n\n\n\n

Jawab:<\/p>\n\n\n\n

Mula-mula, tentukan dahulu momen inersia bola pejal tersebut.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Selanjutnya, gunakan rumus energi kinetik rotasi.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Jadi, energi kinetik rotasi bola pejal tersebut adalah 0,036 J.<\/p>\n\n\n\n

Sampai sini, apakah Quipperian sudah paham?<\/p>\n\n\n\n

Itulah pembahasan Quipper Blog tentang energi kinetik. Semoga bermanfaat, ya. Untuk mendapatkan materi lengkapnya, yuk buruan gabung Quipper Video. Salam Quipper!<\/p>\n","protected":false},"excerpt":{"rendered":"

Hai Quipperian, saat kamu mengendarai sepeda lalu kamu melakukan pengereman secara mendadak, biasanya akan terdengar bunyi gesekan antara as roda dengan jalan kan? Namun,…<\/p>\n","protected":false},"author":156447303,"featured_media":314795,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[679384877],"tags":[],"ppma_author":[679386823,679386838],"class_list":["post-314792","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fisika"],"acf":[],"yoast_head":"\nPengertian Energi Kinetik, Manfaat, Rumus dan Contoh Soalnya - Quipper Blog<\/title>\n<meta name=\"description\" content=\"Energi kinetik adalah energi yang dimiliki benda karena kecepatannya. Itu artinya, benda yang diam tidak memiliki.. 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