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Why is the surface of a slide polished t...

Why is the surface of a slide polished to make it smooth ?

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Smoothening reduces the friction offered by the wooden surfaces.
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Which force gets reduced when the two surface in contact are polished to make them smooth ?

(A) : Polishing a surface beyond a certain limit increases rather than decreases the frictional forces . (R) : When the surface is polished beyond a certain limit , the molecules exert strong attractive force . This is called surface adhesion , to overcome which additional force is required . Hence frictional force increases .

When two surface are polished, the friction coefficient between them decreases. But the friction coefficient increases and becomes very large if the surfaces are made highly smooth. Explain.

A particle slides on the surface of a fixed smooth sphere starting from the topmost pont. Find the angle rotated by the radius through the particle, when it leaves contact with the sphere.

When the surfaces in contact are made too smooth by polishing, force of friction.

Why frictional force gets increased when two surfaces in contact are polished beyond a certain limit ?

A sphere of mass m and radius R rolls without sliding on a horizontal surface. It collides with a light spring of stiffness K with a kinetic energy E . If the surface ( AB ) under the spring is smooth, find the maximum compression of the spring.

A hollow smooth uniform A of mass 'm' rolls without sliding on a smooth horizontal surface collides head to elastically with another stationary smooth solid sphere B of the same mass m and same radius. The ratio of kinetic energy of 'B' to that of 'A' just after the collision is - .

PEARSON IIT JEE FOUNDATION-FRICTION-Competition Corner
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