HOTS Science Primary 6 Energy

A ball is released from Point A on a track. It rolls down to Point B and then up to Point C. If there is NO friction, which of the following is true?

A The Kinetic Energy at B is less than the GPE at C.
B The GPE at A is equal to the Kinetic Energy at B.
C The total energy at A is greater than at B.
D The ball will stop at Point B.
Show Worked Solution

Worked Solution

Step 1: At A, the ball has maximum GPE and zero Kinetic energy. Step [2-9]: At B (the lowest point), all GPE has been converted to Kinetic energy. Step [2-9]: Without friction, no energy is lost as heat, so GPE(A) = KE(B).

Correct answer: The GPE at A is equal to the Kinetic Energy at B.

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