Standard Science Primary 6 Interactions

Two identical balls, A and B, are dropped from different heights. Ball A is dropped from 2 metres and Ball B is dropped from 5 metres. Which of the following is correct just before they hit the ground?

A Both balls have the same amount of kinetic energy.
B Ball A has more gravitational potential energy than Ball B.
C Gravitational force only acts on Ball B.
D Ball B has more kinetic energy than Ball A.
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Worked Solution

Step 1: Ball B starts at a greater height, so it has more Gravitational Potential Energy. Step [2-9]: As they fall, GPE is converted to Kinetic Energy. Step [2-9]: Ball B will have more Kinetic Energy just before impact.

Correct answer: Ball B has more kinetic energy than Ball A.

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