Alana summarized what happens when a ball sitting on top of a grassy hill rolls down the hill.The motionless ball has potential energy. Once the ball starts to roll down the hill, new kinetic energy is made. As the ball rolls across the grass, it slows down. The kinetic energy of the ball is converted to other forms of energy.
Answer
A
The motionless ball does not have energy because it is still.
B
Kinetic energy is not made; it is a result of energy transformation.
C
The ball cannot slow down unless someone touches it.
D
The energy is not converted; it disappears.
Explanation
The ball at the top has gravitational potential energy because of its position. As it rolls downhill, that stored energy changes into kinetic energy; kinetic energy is not newly created. As the ball slows on the grass, friction transforms some of its kinetic energy into heat and sound. Therefore, the correct choice is B, “Kinetic energy is not made; it is a result of energy transformation.”
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