A disc spinning clockwise about its axis with angular velocity `omega_0` is set on a rough horizontal plane[Fig.].
What si the direction of frictional force at point P and sense of frictional torque ,before pure rolling starts?
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A disc spinning clockwise about its axis with angular velocity omega_0 is set on a rough horizontal plane[Fig.]. What is the force of friction after rolling without slipping starts? .

Explain why friction is necessary to make the disc roll in the direction indicated. Given the direction of friction force at B, and the sense of frictional torque, before perfect rolling begins.

A disc of radius R is rotating with an angular speed omega_0 about a horizontal axis. it is placed on a horizontal table. The coefficient of kinetic friction is mu_k . What condition should be satisfied for rolling to begin?

A disc of radius R is rotating with an angular speed omega_0 about a horizontal axis. it is placed on a horizontal table. The coefficient of kinetic friction is mu_k . Calculate the time taken for the rolling to begin.

A mass attached to a spring is free to oscillate, with angular velocity omega , in a horizontal plane without friction or damping. It is pulled to a distance x_0 and pushed towards the centre with a velocity v_0 at time t = 0. Determine the amplitude of the resulting oscillations in terms of the parameters omega , x_0and v_0 .

A disc rotating about its axis with angular speed omega_0 is placed lightly (without any translational push) 011 a perfectly frictionless table. The radius of the disc is R. What are the linear velocities of the points A, B and C on the disc shown in Fig. 7.41? Will the disc roll in the direction indicated ?

A disc of radius R is rotating with an angular speed omega_0 about a horizontal axis. it is placed on a horizontal table. The coefficient of kinetic friction is mu_k . What was the velocity of its centre of mass before being brought in contact with the table?

A disc of radius R is rotating with an angular speed omega_0 about a horizontal axis. it is placed on a horizontal table. The coefficient of kinetic friction is mu_k . Which force is responsible for the effects in what happens to the linear velocity of a point on its rim when placed in contact with the table? and What happens to the linear speed of the centre of mass when disc is placed in contact with the table?

Two cylindrical hollow drums of radii and 2R, and of a common height h, are rotating with angular velocities omega (anticlockwise) and omega (clockwise), respectively, Their axes, fixed are parallel and in a horizontal plane separated by (3R + delta) . They are now brought in contact (deltararr 0) . Show the frictional forces just after contact.