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?

Q1-1. 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?

 

Answer:  while coming downhill the potential energy (P.E) of the bicyclist will be converted into Kinetic energy ( K.E ) so the speed of the bicyclist increase. this does not violate the conservation of energy principle. there is no new energy generated. its just converted from type to another type.

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