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Pure Rolling

A sphere is r...

Question

A sphere is rolled on a rough horizontal surface. It gradually slows down and stops. The force of friction tends to :

A

decrease linear velocity

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B

increase linear momentum

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C

decrease angular velocity

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D

increase angular velocity

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Solution

The correct options are
B decrease linear velocity
D increase angular velocity
The force of friction must be acting in opposite direction to the velocity of point of contact of sphere. So it decreases the linear velocity.
Also, the torque due to frictional force is in direction of angular velocity, so angular velocity is increased.

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