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Class 11
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Friction
Friction
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1)
Which of the following can be a reason for friction?
Interlocking of projections and compressions on the surface of contact.
Electromagnetic force
Both 1 and 2
The adhesive force between the surfaces.
2)
Frictional force is an example of what type of force?
Can be contact or non contact
Contact force
None of these
Non contact force
3)
What is the reason for slipping while walking on ice?
There is little friction on ice.
There is a lot of friction on ice.
None of these
There is a large normal reaction.
4)
What is the direction of frictional force ?
Normal to the direction of movement of object
Opposite to the direction of movement of the object
Depends on the angle of inclination of the plane with the horizontal
Same as that of movement of the object
5)
Which best describes friction?
Can be scalar or vector
Scalar quantity
Vector quantity
None of these
6)
What is the type of friction when a body rolls over another body?
Limiting friction
Sliding friction
Static friction
Rolling friction
7)
Which of the following statements is correct?
The relation between sliding friction and rolling friction can be vary with the environment
Rolling friction is greater than sliding friction
Sliding friction is greater than rolling friction
Sliding friction and rolling friction are of same magnitude
8)
Which type of friction belongs to the category of kinetic friction?
Sliding friction
Limiting friction
Rolling friction
Both 1 and 3
9)
Maximum value of static friction is called .......... .
Coefficient of friction
Limiting friction
Rolling friction
Normal reaction
10)
A force of 294N is required to start moving an object of 100kg in a horizontal plane. Calculate the coefficient of friction.
0.6
0.03
0.3
0.1