Work done by a frictional force is...

Work done by a frictional force is

Is always zero

is always negative

Is always positive

May be positive, negative or zero

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Work done by frictional force

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

Assertion : Work done by the frictional force is negaive Reason : This is because frictional force acts along the dirction of motion

A trolley car starts from rest at the top of a hill as shown in figure -3.9 and moves down the curved track. Determine its speed as it reaches the bottom. Assume that the work done by frictional forces is negligible.

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) ).

The work done by the frictional force on a surface in a drawing a circle of radius r on the surface by a pencil of negligible mass with a normal pressing force N ( coefficient of friction )is :

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

AAKASH INSTITUTE-WORK, ENERGY AND POWER-SECTION-A (OBJECTIVE TYPE QUESTIONS (ONE OPTIONISCORRECT)

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