Match the column I with column II - array - c - c - Whine column1 - column2llthlinea When non conservative forces are acting - p work done by force may be negative lllhlineb In the case of a a pendulum-work done by the tension - q Net work done is zero lilhlinec When there is friction - r The only force acting is gravity lWhlined In Projectile motion - s Work done by force in a round trip is not equal to zero IWhlinelend array A- A-Q-R B-Q-R C-Q-R D-P-R- B- A-P- S B-Q C-P- S D-R - C- A - Q B - Q - R C - S -D-Q- D- A-Q B-Q C-Q- R D-P -

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Byju's Answer

Standard XII

Physics

Displacement of COM:Application

Match the col...

Question

Match the column I with column II :
$\begin{matrix} c o l u m n 1 & c o l u m n 2 a) W h e n n o n c o n s e r v a t i v e f o r c e s a r e a c t i n g & p) w o r k d o n e b y f o r c e m a y b e n e g a t i v e b) I n t h e c a s e o f a p e n d u l u m, w o r k d o n e b y t h e t e n s i o n & q) N e t w o r k d o n e i s z e r o c) W h e n t h e r e i s f r i c t i o n & r) T h e o n l y f o r c e a c t i n g i s g r a v i t y d) I n P r o j e c t i l e m o t i o n & s) W o r k d o n e b y f o r c e i n a r o u n d t r i p i s n o t e q u a l t o z e r o \end{matrix}$

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

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

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

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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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