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Question

A cyclist free-wheels from the top of a hill, gathers speed going down the hill, apply his brakes and eventually came to rest at the bottom of the hill. Which one of the following energy changes take place?

A
Potential to kinetic to heat energy
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B
Kinetic to potential to heat energy
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C
Chemical to heat to potential energy
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D
Kinetic to heat to chemical energy
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Solution

The correct option is A Potential to kinetic to heat energy
Considering ground as zero potential
Initially E=U+K=U+0=U
Finally E=U+K=0+0=0
So, initially it had some potential energy, it was converted to kinetic energy by gaining speed, it finally became zero so energy must have been lost as heat while applying brakes.

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