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Column-I

Column- II

(A)

A spinning ball lowered on a rough surface

(p)

Net work done by friction force is negative

(B)

A ball is projected with velocity on a rough surface

(q)

Angular momentum about the CM is conserved

(C)

A ball projected with velocity  projected on a smooth borizontal on a smooth borizontal surface

(r)

Translation work done by friction is positive

(D)

A spool pulled by a fore, rolling without slipping on a rough surface

(s)

Net work done by friction is zero

CODES :

 

A

B

C

D

 

 

a)

A,b,c

a

d

d

 

 

b)

c

d

b

a

 

 

c)

c

a

d

c,d

 

 

d)

b,a

b,c

d

a,c

 

 



Question ID - 101098 | SaraNextGen Top Answer

Column-I

Column- II

(A)

A spinning ball lowered on a rough surface

(p)

Net work done by friction force is negative

(B)

A ball is projected with velocity on a rough surface

(q)

Angular momentum about the CM is conserved

(C)

A ball projected with velocity  projected on a smooth borizontal on a smooth borizontal surface

(r)

Translation work done by friction is positive

(D)

A spool pulled by a fore, rolling without slipping on a rough surface

(s)

Net work done by friction is zero

CODES :

 

A

B

C

D

 

 

a)

A,b,c

a

d

d

 

 

b)

c

d

b

a

 

 

c)

c

a

d

c,d

 

 

d)

b,a

b,c

d

a,c

 

 

1 Answer
127 votes
Answer Key / Explanation : (a) -

(a)

a. increases,  decreases, hence translation work by friction is positive and rotational work is negative. But overall work will be negative because the friction is kinetic

b.  decreases, increases, overall work by friction will be negative

c. This is pure rolling with constant velocity. No friction will act

d. Here  will pass through the contact point. It will not move. Hence, work by friction is zero

127 votes


127