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A disc is in pure rolling motion on a ro...

A disc is in pure rolling motion on a rough horizontal surface. It enters into a frictionless horizontal surface. What will happen?

A

the disc will rotate faster

B

the disc will translate faster

C

The disc will be in pure rolling motion without any change

D

The disc will have translation once it enters surface

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A disc shaped body (having a hole shown in the figure) of mass m=10kg and radius R=10/9m is performing pure rolling motion on a rough horizontal surface. In the figure point O is geometrical center of the disc and at this instant the centre of mass C of the disc is at same horizontal level with O . The radius of gyration of the disc about an axis pasing through C and perpendicular to the plane of the disc is R/2 and at the insant shown the angular velocity of the disc is omega=sqrt(g/R) rad/sec in clockwise sence. g is gravitation acceleration =10m//s^(2) . Find angular acceleation alpha ( in rad//s^(2) ) of the disc at this instant.

Knowledge Check

  • When a rolling body enters onto a smooth horizontal surface, it will

    A
    Continue rolling
    B
    Starts slipping
    C
    Come to rest
    D
    Slipping as well as rolling

  • When a body is rolling without slipping on a rough horizontal surface, the work done by friction is :

    A
    Always zero
    B
    May be zero
    C
    Always positive
    D
    Always negative

  • A sphere is performing pure rolling on a rough horizontal surface with constant angular velocity. Frictional force acting on the sphere is zero. Velocity of contact point is zero.

    A
    Statement-1 is True, Statement-2 is Ture , Statement -2 is a correct explanation for statement -1.
    B
    Statement-1 is True, Statement-2 is True , Statement-2 is NOT a correct explanation fro Statement -1.
    C
    Statement-1 is True, Statement-2 is False.
    D
    Statement-1 is False, Statement-2 is True.

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