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KVPY SX SB Exam 19-Nov-2017 Question Paper
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© examsnet.com
Question : 36
Total: 120
A small ring is rolling without slipping on the circumference of a large bowl as shown in the figure. The ring is moving down at
P
1
, comes down to the lower most point
P
2
and is climbing up at
P
3
. Let
→
v
CM
denote the velocity of the centre of mass of the ring. Choose the correct statement regarding the frictional force on the ring.
It is opposite to
→
v
CM
at the points
P
1
,
P
2
andP
3.
It is opposite to
→
v
CM
at
P
1
and in the same direction as
→
v
CM
at
P
3.
It is in the same direction as
→
v
CM
at
P
1
and opposite to
→
v
CM
at
P
3
.
It is zero at the points
P
1
,
P
2
and
P
3
Validate
Solution:
fr
1
will increase ω.
fr
3
will decrease ω
© examsnet.com
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