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Question

Give reasons for the following- The force, needed to start a cart, is (somewhat) greater than the force needed to keep it moving with a uniform speed.

Answer

The force needed to start a cart is greater than the force needed to keep it moving with a uniform speed, because the force needed to start a cart is applied against the Static friction caused by the stronger interlocking of the irregularities or roughness of the surface of wheel and floor. Once, the motion starts the contact points on one surface do not get enough time to lock into the contact point of another surface.