English for students of Physics_Unit 10

Chia sẻ: Xu Ka | Ngày: | Loại File: PDF | Số trang:18

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English for students of Physics_Unit 10

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Toss your keys along the floor, they’ll skitter along for a bit as friction does negative work on them, reducing their kinetic. Quickly, the keys come to rest, and the kinetic energy you gave them is gone. But in this case they can’t turn around (as they did when you picked them up), gather speed from the same frictional force that acted to slow them, and jump back into your hand with the same kinetic energy. Once the motion stops, the friction stops, and it can not restore the kinetic energy of the keys as gravity is able to...

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