Answers to GPE

1 The energy something has due to its high position. 1

Total 1

2 Six examples of objects with gravitational

potential energy.

One mark for each correct object. 6

One mark for object’s high position correctly identified. 6

Total 12

3 (a) Increases. 1

(b) Decreases. 1

Total 2

4 The chair, 1

because it has most mass. 1

Total 2

5 (a) Increases. 1

(b) Move the book from the floor to the middle shelf

(or from the bottom shelf to the top shelf). 1

Doing this will double its height. 1

Total 3

6 On Earth, the change in gravitational potential

energy would be greater, 1

because Earth’s gravitational field strength is greater. 1

Total 2

7 (a) (i) Weight of chair = mg = 5 × 10 = 50 N. 1

(ii) Change in E = mgh = 50 × 0.8 1

= 40 1J. 1

(b) (i) 0.400kg. 1

(ii) Change in E = mgh = 4 × 0.8 = 3.2 J. 1

Total 6

8 (a) Change in E = mgh = 0.020 × 10 x 0.70 1

= 0.14 J. 1

(b) Change in E = mgh = 0.020 × 10 x 1.60 = 0.32 J. 1

(c) Overall change = 0.32 – 0.14 = 0.18 J. 1

Total 4