This is relating to work and energy Consider the following discussion about the

Question

This is relating to work and energy

Consider the following discussion about the situation described above:

Devin: “When the book was lifted up, it gained potential energy but not kinetic energy. That means

the change in total mechanical energy is positive.”  

Kyle: “Also, the net work on the book is zero, because the work you did on the book is cancelled by

the work the earth did on the book.”  

Voli: “Does this mean the law of conservation of energy is violated? There was zero net work on the book but its energy increased.”

4. Which of these ideas are solid and which ideas need to be revised? Discuss how you would help Devin, Kyle, and Voli makes sense of the situation.

Explanation / Answer

a)

When the books is lifted from the goround, work is done against the gravitational force with increase in Kinetic energy. The change in total mechanical energy is positive. )

b)

The net work done is non zero because the change in total energy is positive.

c) No, law of conservation of energy not violated.

b

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