Advanced Science Primary 6 Energy

A ball is dropped from a height of 2 meters. Which of the following statements about its energy is correct as it falls?

A Both its kinetic and potential energy increase.
B Both its kinetic and potential energy decrease.
C Its kinetic energy increases while its gravitational potential energy decreases.
D Its kinetic energy decreases while its gravitational potential energy increases.
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Worked Solution

Step 1: Gravitational Potential Energy (GPE) depends on height. As height decreases, GPE decreases. Step [2-9]: Kinetic Energy (KE) depends on speed. As it falls, gravity accelerates it, so KE increases. Step [2-9]: GPE is converted into KE.

Correct answer: Its kinetic energy increases while its gravitational potential energy decreases.

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