1f normal force is doubled what happens to friction?Discuss
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If normal force is doubled the coefficient of the kinematic friction of a body also doubled up to the motion about to started. But once after the movement is started and continues to move, the kinetic friction decreases as force doubled.
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If we double the normal force, we double the amount of friction, but the coefficient of friction is the same, since the nature of the two surfaces in contact has not changed.
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