A block weighing 10n rests on a horizontal surface the coefficient of static friction between the block and the surface is 0.4 and the coefficient of sliding friction is 0.2 if a horizontal force of 5n is applied on a block the magnitude of the frictional force acting on the block is
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Since there is no applied force, there is no force of friction. (b) Force of friction is a self-adjusting force. During the stationary state, it is equal to the applied force. Hence the magnitude of frictional force on it is 10 N.
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