Netwon's Second Law tells us force equals mass multiplied by acceleration of F = m a . Consider bicycle that accelerates uniformly away from rest on a horizontal surface. The only source of energ

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Netwon's Second Law tells us force equals mass multiplied by acceleration of F = m a . Consider bicycle that accelerates uniformly away from rest on a horizontal surface. The only source of energy available to accelerate the bicycle is that provided by the rider of the bike. If a in Newton's Second Law is the acceleration of the bicycle F is :

TestHub · Accepted Answer

The bicycle accelerates forward, so the net external horizontal force on bicycle plus rider is forward.

The rider's leg force and the chain force are internal. The only external horizontal force is the friction of the road on the wheels, so $F$ is the friction between the road and the wheels.

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