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Identify the correct order in which the ratio of radius of gyration to radius increases for the following bodies. (I) rolling solid sphere (II) rolling solid cylinder (III) rolling hollow sphere (IV) rolling hollow sphere

Explain the origin of (i) sliding friction (ii) the rolling friction .

How many different outcomes arise from first tossing a coin and then rolling a die?

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The torque can be applied only about two points (a) centre of mass and (ii) point about which the body is rolling. The equation a = r alpha can always be applied in case of rolling.

Statement-I : When a sphere and a solid cylinder are allowed to roll down an inclined plane, the sphere will reach the ground first even if the mass and radius of the two bodies are different. Statement-II : The acceleration of the body rolling down the inclined plane is directly proportional to the radius of the rolling body.

What do you mean by ball bearings ? How sliding friction is converted into rolling friction ?