The magnitude of the force of friction is ____________ to the force, – McqOptions

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1.	The magnitude of the force of friction is ____________ to the force, which tends the body to move.
A.	equal
B.	different
C.	both of the mentioned
D.	none of the mentioned
Answer» B.

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A wooden block is kept on a polished wooden plank and the inclination of the plank is gradually increased. It is found that the block starts slipping when the plank makes an angle of 18° with the horizontal. However, once started the block can continue with uniform speed if the inclination is reduced to 15°. Find the coefficient of kinetic friction between the block and the plank.
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