Topic Menu

Cyber-chess a chess instruction site

Questions on Energy Transitions

Q8. A bookshelf is 1 metre above the floor. As a book falls from the shelf to the floor it loses 7.5 J of potential energy.

(a)

(i) Select the correct statement about the kinetic energy of the book.

A
 While the book was resting on the shelf it had 7.5 J of kinetic energy.
B
 While the book was falling, its potential energy was being transferred into kinetic energy.
C
 While the book was falling its kinetic energy remained constant.
D
 While the book was falling it lost kinetic energy.

1 mark

(ii) How much kinetic energy does the book have just before it hits the floor?

1 mark

(b) When the book hits the floor it stops and loses all its kinetic energy. What happens to this energy?

1 mark

Maximum 3 marks