Why does a bicyclist pick up speed on a downhill road even when he is not pedaling? Does this violate the conservation of energy principle?
Kinetic energy is energy due to the motion of the body. Simply, kinetic energy means the energy of motion. If the body moves, it means it has some kinetic energy. Kinetic energy is the one form of the two main energies; another one is potential energy.
Answer and Explanation:
A bicyclist picks up speed on a downhill road even when no pedaling is done, because the potential energy due to the height of a hill is converted into an equal increase in kinetic energy. Hence, his speed is increased by going down along the slope.
Here, with decreasing potential energy, on the other hand, it is converted into an equal increment in kinetic energy.
So, energy is conserved.
Hence, it does not violate the conservation of energy principle.
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from Science for KidsChapter 11 / Lesson 29