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In picking up a book from the floor and putting it on a table, you do work. However, the kinetic energy of the book does not change. Is there a violation of the work- energy theorem here? Explain why or why not.

In picking up a book from the floor and putting it on a table, you do work. However, the kinetic energy of the book does not change. Is there a violation of the work- energy theorem here? Explain why or why not.

Grade:10

1 Answers

Jitender Pal
askIITians Faculty 365 Points
8 years ago
Work-energy theorem states that, the net work done by the forces acting on a body is equal to the change in the kinetic energy of the body. Although the kinetic energy of the book does not change picking up a book from the floor and putting it on a table, but the potential energy of the book increases. According to thermodynamics, the net work done by the forces acting on a body is equal to the change in the internal energy of the body Since the potential energy increases therefore the sign of the work done will be positive. Thus it does not violate the work-energy theorem.

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