# physics

A 257kg motor cycle and rider accelerate from rest and reach a velocity of 20 meters per second west. The motor cycle wheels exert an average force 710N east of the road.Explain how the force directed east causes the motorcycle to accelerate west

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1. That force East is opposed by Earth. Actually, the motorcycle is starting to increase the speed of rotation of Earth,but is is very massive, and the change in rotation is very, very small. Since the Earth is opposing this motion, it is pushing back on the motorcycle westward, and the motorcycle moves west across the earth. Overall, the momentum changes in Earth Rotation and the motorcycle rotation are equal, keeping the conservation of momentum law intact (total momentum change is zero)

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2. I don't know the answer... Call me @076 997 2551, for other physics info

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posted by Michael

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