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When a bicycle moves in the forward dire...

When a bicycle moves in the forward direction what is the direction of the frictional force in the rear and front wheels

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When we pedal a bicycle we try to push the surface beackward and the velocity of point of contact in the rear wheel is backwards. So the frictional force pushes the rear wheel to move forward .if the wheel slips then kinetic friction comes into effect. In addition to static friction , the rolling friction also on both wheels in the backwards direction .
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