Work done by a frictional force is...

Work done by a frictional force is

can be zero

can be positive

can be negative

any of the above

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STATEEMNT-1 : Work done by frictional force is always either negative or zero. because STATEMENT-2 : Work done by the static friction on a system may be zero.

Work done by frictional force

A : Work done by the frictional force can’t be positive. R : Frictional force is a conservative force.

A block of mass 1 kg slides down a vertical curved track that is one quadrant of a circle of radius 1m. Its speed ast the the bottom si 2 m//s . The work done by frictional force is :

Find the work done by the frictional force in drawing a circle of radius r by a pencil of negligible mass with a normal pressing force N ( coefficient of friction mu_(k) ).

Assertion :- Work done is positive when force acts in the direction of displacement. Reason :- Work done by frictional force can not be positive.

Assertion :- Work done by frictional force may be sometimes path independent. Reason :- Frictional force is a non - conservative force.

A block of mass 1 kg is pulled slowly along the curve path ACB by a tangential force as shown in figure. The magnitude of work done by the frictional force when the block moves from A to B is

An object is pushed and pulled along a certain angle with respect to horizontal and is moved the some distance on the ground. Now the work done by frictional force will be more in

Consider a uniform disc of mass m , radius r rolling without slipping on a rough surface with linear acceleration a and angular acceleration alpha due to an external force F as shown in the figure coefficient of friction is mu . Q. The work done by the frictional force at the instant of pure rolling is

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Work done by a frictional force is
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