Column-I |
Column- II |
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(A) |
A spinning ball lowered on a rough surface |
(p) |
Net work done by friction force is negative |
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(B) |
A ball is projected with velocity |
(q) |
Angular momentum about the CM is conserved |
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(C) |
A ball projected with velocity |
(r) |
Translation work done by friction is positive |
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(D) |
A spool pulled by a fore |
(s) |
Net work done by friction is zero |
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CODES : |
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|
A |
B |
C |
D |
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a) |
A,b,c |
a |
d |
d |
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b) |
c |
d |
b |
a |
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c) |
c |
a |
d |
c,d |
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d) |
b,a |
b,c |
d |
a,c |
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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 |
(q) |
Angular momentum about the CM is conserved |
||||||
(C) |
A ball projected with velocity |
(r) |
Translation work done by friction is positive |
||||||
(D) |
A spool pulled by a fore |
(s) |
Net work done by friction is zero |
||||||
CODES : |
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|
A |
B |
C |
D |
|
|
|||
a) |
A,b,c |
a |
d |
d |
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b) |
c |
d |
b |
a |
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c) |
c |
a |
d |
c,d |
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d) |
b,a |
b,c |
d |
a,c |
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|
(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