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Stone of mass m tied to the end of a string is revolved in a vertical circle of radius R
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1
|
1641
|
August 18, 2016
|
|
What is the direction of force of friction?
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0
|
452
|
August 18, 2016
|
|
Why is friction called self-adjusting force?
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0
|
6459
|
August 18, 2016
|
|
Explain how proper inflation of tyres saves fuel
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0
|
4918
|
August 18, 2016
|
|
Sand is thrown on tracks or roads covered with snow. Explain why?
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0
|
4933
|
August 18, 2016
|
|
A body moving over the surface of another body suddenly comes to rest What happens to friction between the two surfaces?
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0
|
1060
|
August 18, 2016
|
|
Find speed of the block at the bottom?
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0
|
616
|
August 18, 2016
|
|
Why force of friction increases when the two surfaces in contact are made extremely smooth, i.e., polished beyond a certain limit?
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0
|
2215
|
August 18, 2016
|
|
Give one argument in favour of the fact that frictional force is a non-conservative force
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0
|
935
|
August 18, 2016
|
|
Explain why is it difficult to move a cycle along a road with its brakes on?
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0
|
3369
|
August 18, 2016
|
|
Explain how lubricants reduce friction
|
|
0
|
1907
|
August 18, 2016
|
|
Why automobiles tyres have generally irregular projections over their surface?
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|
0
|
2634
|
August 18, 2016
|
|
Sometimes we need to increase friction. Why?
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|
0
|
2624
|
August 18, 2016
|
|
Why a horse has to apply more force to start a cart than to keep it moving ? Explain
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|
0
|
2850
|
August 18, 2016
|
|
What is rolling friction?
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0
|
1303
|
August 18, 2016
|
|
A body falls from a single story building roof on a muddy floor and another boy falls from the same height on a stone, who is likely to survive and why?
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|
0
|
593
|
August 18, 2016
|
|
Is it possible that a particle moving with a constant velocity may not have a constant speed?
|
|
0
|
522
|
August 18, 2016
|
|
How would you explain the motion of a motor cyclist in a globe of death in a circus?
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|
0
|
440
|
August 18, 2016
|
|
At which place on earth, the centripetal force is maximum?
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|
0
|
2161
|
August 18, 2016
|
|
Explain why jet planes cannot move in air free space but rockets can move?
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|
0
|
1596
|
August 18, 2016
|
|
How does air friction affect the maximum height of a projectile?
|
|
0
|
507
|
August 18, 2016
|
|
Why rockets are given conical shapes?
|
|
0
|
2572
|
August 18, 2016
|
|
Why is it easier to roll than to pull a barrel along a road?
|
|
0
|
2238
|
August 18, 2016
|
|
Why do we pull rope downwards for climbing up?
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|
0
|
1198
|
August 18, 2016
|
|
Suppose you are seated in a cabin which has no doors, no windows etc. and is also sound proof. Shall it be possible to detect the uniform velocity with which this cabin is moving? Why?
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|
0
|
511
|
August 18, 2016
|
|
Mention conditions for maximum and minimum pull of a lift on a supporting cable
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|
0
|
1986
|
August 18, 2016
|
|
Is the law of conservation of momentum valid for a system consisting of more than two particles?
|
|
0
|
852
|
August 18, 2016
|
|
Can a body in linear motion be in equilibrium? Why?
|
|
0
|
1566
|
August 18, 2016
|
|
A passenger sitting in a bus at rest pushes it from within. Will it move? Why?
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|
0
|
452
|
August 18, 2016
|
|
Action and reaction are equal in magnitude and opposite direction, then why do not they cancel/ balance each other?
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|
0
|
972
|
August 18, 2016
|