HOTS Science Primary 6 Energy

A ball is released from Point A and rolls down a track through Points B and C. If the track is rough, which statement is true about its energy at Point C compared to Point A?

A Potential energy at C is greater than at B.
B The total energy at C is higher than A.
C The total mechanical energy at C is lower than at A due to heat loss.
D The kinetic energy at C is equal to the potential energy at A.
Show Worked Solution

Worked Solution

Step 1: At A, the ball has GPE. Step [2-9]: As it rolls, friction on the rough track converts some energy into heat and sound. Step [2-9]: Therefore, the mechanical energy (GPE + KE) at C will be less than the starting energy.

Correct answer: The total mechanical energy at C is lower than at A due to heat loss.

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