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Question

Match the column I with column II :
column1column2a) When non conservative forces are actingp) work done by force may be negativeb) In the case of a pendulum,work done by the tensionq) Net work done is zeroc) When there is frictionr) The only force acting is gravityd) In Projectile motions) Work done by force in a round trip is not equal to zero


A

A-Q,R B-Q,R C-Q,R D-P,R

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B

A-P,S B-Q C-P,S D-R

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C

A-Q B-Q,R C-S D-Q

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D

A-Q B-Q C-Q,R D-P

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Solution

The correct option is B

A-P,S B-Q C-P,S D-R


1. When non - conservative forces are acting work done in a round trip is not equal to zero and also it can be negative.

2. In case of a pendulum, the angle between tension and displacement is 90 degrees hence work done is zero.

3. When there is friction, work done can be negative and being a non-conservative force work done is not zero in a round trip.

4. In projectile motion, the only force acting is gravity.


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