A mass m is moving with a constant velocity along a line parallel to the x-axis,away from the origin. Its angular momentum with respect to the origin:

A solid sphere, a hollow sphere and a disc, all having same mass and radius are placed at the top of a smooth incline and released. Least time will be taken in reaching the bottom by:

(i) The speed of the rolling object at the bottom of the incline is less than that of an object sliding down the incline if both of them are released from rest

from the same height.

(ii) If frictional force is very small the object may not roll and will slip

Pick for MCQs 2 to 2

a. If assertion and reason both are true and reason is correct explanation

of assertion

b. If assertion and reason both are true but reason is not the correct

explanation of assertion

c. If assertion is true but reason is false

d. If assertion is false but reason is true

 A : A sphere and cylinder having same masses and radii are released together

from the top of an inclined plane and roll down along lines of greatest slope

without slipping but with negligible rolling friction. The sphere reaches the

bottom first.

R : Angular acceleration of a cylinder is smaller.