Power
2 marks · EasyExplain what happens to the gravitational potential energy and kinetic energy of a ball as it rolls down a smooth slope.
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Common mistakes: Not mentioning both GPE and KE; Describing energy as 'lost' with no transfer
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Marking points
B1 · 1 mark · States that gravitational potential energy decreases
B2 · 1 mark · States that kinetic energy increases as the ball speeds up
Worked solution
As the ball rolls down, its gravitational potential energy decreases, and its kinetic energy increases.