HOTS Science Primary 6 Energy

A ball is released from the top of a smooth track at Point A. It rolls down to Point B and then up to Point C. If no energy is lost to the surroundings, which statement about its energy is TRUE?

A The kinetic energy at B is equal to the potential energy at A.
B The kinetic energy at C is zero if C is at the same height as A.
C The total energy at B is greater than at A.
D The potential energy at C is greater than at A.
Show Worked Solution

Worked Solution

Step 1: Use the Principle of Conservation of Energy. Step [2-9]: At Point A, the ball has maximum GPE and zero KE. Step [2-9]: If Point C is at the same height as A, all KE at B must have been converted back to GPE, leaving KE at zero.

Correct answer: The kinetic energy at C is zero if C is at the same height as A.

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