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Compare static friction and kinetic fric...

Compare static friction and kinetic friction.

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Rolling friction, static friction, sliding fricition.

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 coefficients of static and kinetic friction between the block and the plank.

A plank with a box on it at one end is gradually raised about the other end. As the angle of invlination with the horizontal reaches 30^@ , the box starts to slip and slides 4.0 m down the plank in 4.0s.The coefficients of static and kinetic friction between the box and the plank will be, respectively: .