Hukum kekekalan energi
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![Page 1: Hukum kekekalan energi](https://reader033.fdocumentos.tips/reader033/viewer/2022052301/55958d851a28abe7798b4701/html5/thumbnails/1.jpg)
HUKUM
KEKEKALAN
ENERGI
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Energi merupakan kekampuan
untuk melakukan kerja
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Energi tidak dapat
diciptakan
dan tidak dapat
dimusnahkan.
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Energi dapat
berubah
“bentuk.”
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Energi Kinetik
▲▼
Energi Potensial
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Energi Kinetik
K = ½ mv2
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Energi Potensial
U = mgh
U = ½ kx2pada pegas
U = Gm1m2(1/r22 − 1/r1
2) gravitasi
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Energi Mekanik
=
Energi Kinetik (K) +
Energi Potensial (U)
E = K+U
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Bentuk-Bentuk Energi
Lainnya:
Energi Termal
Energi Listrik
Energi NuklirEnergi Kimia
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Dan lain-lain…..
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Tahukah???
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2 Joule bisa
membuat tulang pahapatah.
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9,8 Joule
digunakan tangan
untuk mengangkat
beban1 kg setinggi 1 meter.
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213 Joule
diperoleh setiap hari
dengan memakannasi.
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4200 Joule
diperlukan untuk
menaikkan suhu1 kg air sebesar 1°C.
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7000000 Joule
diperlukan untukmelelehkan 1 kg timah.
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50000000 Joule
dihasilkan dari
pembakaran1 kg bensin.
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2000000000000 Joule
dihasilkan dari 1 kg
reaksi nuklir uranium oksida.
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Di dalam Teori
Relativitas,
Einstein
menyatakan
massa bisa
diubah menjadi
energi dan
sebaliknya.
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Kesetaraan Energi dan
Massa
E = mc2
<Siapa yang tidak kenal rumus ini?>
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Tahukahn???
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KERJA
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Kerja merupakan
proses memindahkan
energi.
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Syarat kerja:
Ada gaya yang
dilakukan kepada
benda, dan
benda berubah posisi.
W = Fd
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Kerja mengakibatkan
energi suatu bendaberubah.
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Kerja
=
PerubahanEnergi Potensial
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Teorema Kerja-Energi
Potensial
W = −∆U
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Kerja
=
PerubahanEnergi Kinetik
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Teorema Kerja-Energi
Kinetik
W = ∆K
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Gaya nonkonvensional
mengakibatkan tidak
seluruh energi diubahmenjadi kerja.
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Contoh gaya
nonkonvensional yaitugaya gesekan.
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Gaya gesekan
mengakibatkan
sebagian energi
berubah menjadipanas.
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Panas akan mengalir
ke tempat yang bersuhu lebih rendah.
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Sehingga terjadikesetimbangan termal.
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Setiap merubah energi
ke bentuk energi
lainnya akanmenghasilkan panas.
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Tetapi akan sulit
merubah panasmenjadi energi lain.
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Maka diperlukan
penggunaan energiyang efisien.
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Gunakanlah sumber
energi yang ramahlingkungan!