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Home » A disc of radius R is rotating with an angular speed about a horizontal axis. It is placed on a horizontal table. The coefficient of kinetic friction is .a) what was the velocity of its centre of mass before being brought in contact with the table?b) what happens to the linear velocity of a point on its rim when placed in contact with the table?
A disc of radius R is rotating with an angular speed \omega_{o} about a horizontal axis. It is placed on a horizontal table. The coefficient of kinetic friction is \mu_{k}.
a) what was the velocity of its centre of mass before being brought in contact with the table?
b) what happens to the linear velocity of a point on its rim when placed in contact with the table?
CBSE | Class 11 | NCERT Exemplar | Physics | System of particles and rotational motion
A disc of radius R is rotating with an angular speed \omega_{o} about a horizontal axis. It is placed on a horizontal table. The coefficient of kinetic friction is \mu_{k}.
a) what was the velocity of its centre of mass before being brought in contact with the table?
b) what happens to the linear velocity of a point on its rim when placed in contact with the table?

a) Before coming into contact with the table, the disc was rotating, and v_{cm}=0 was the rest.

b) When the revolving disc comes into contact with the table, the linear velocity of the disc decreases due to the friction force acting on the disc.

i

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