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For perfect rolling motion, work done ag...

For perfect rolling motion, work done against friction is zero.

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A cylinder of mass 10 kg and radius 15 cm is rolling perfectly on a plane of inclination 30o. The co- efficient of static friction µ_(s) = 0.25 . (a) How much is the force of friction acting on the cylinder ? (b) What is the work done against friction during rolling ? (c) If the inclination θ of the plane is increased, at what value of θ does the cylinder begin to skid, and not roll perfectly ?