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Is the work done by non conservative fo...

Is the work done by non conservative force is always negative ? Discuss .

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These questions consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following five reponses (a) If both Assertion and Reason arecorrect and Reason is the correct explanation of Asserrtion. (b) If both Assertion and Reason are correct 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. Assertion If work done by conservative force is negative, then potential energy associated with that force should increase. Reason This is according to the relation DeltaU=-W Here, DeltaU is change in potential energy and W is work done by conservative force.

Work done by the conservative force on a system is equal to :

STATEMENT-1: Work-energy theorem is consequence of Newton's laws of motion. STATEMENT-2: The work done by a conservative force along a closed path is zero. STATEMENT3: Work done by a constant force is independent of the path.

Assertion:The work done by a conservative force such as gravity depends on the initial and final positions only Reason: The work done by a force can not be calculated if the exact nature of the force is not known.

The work done by a body against friction always results in

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.

A particle is taken from point A to point B under the influence of a force field. Now it is taken back from B to A and it is observed that the work done in taking the particle from A to B is not equal to the work done in taking it from B to A. If W_(nc) and W_c are the work done by non-conservative and conservative forces present in the system, respectively, DeltaU is the change in potential energy and Deltak is the change in kinetic energy, then

A : The potential energy of a system increases when work is done by conservative force. R : Kinetic energy can change into potential energy and vice-versa.

When is the work done by a force is positive and when is it negative ?