HOTS Science Primary 6 Energy

A ball is dropped from Point A. It hits a spring at Point B, compresses it, and then bounces back up to Point C. If Point C is lower than Point A, which statement is most accurate?

A Energy was created during the bounce.
B Some kinetic energy was converted to heat and sound during the impact.
C The spring gained more energy than the ball lost.
D Total energy at A is equal to the total energy at C.
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Worked Solution

Step 1: Observe that the ball does not return to its original height. Step [2-9]: Note that energy is conserved but can change forms. Step [2-9]: Impact with the ground/spring converts some kinetic energy into non-mechanical forms like heat and sound.

Correct answer: Some kinetic energy was converted to heat and sound during the impact.

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