Friction (Static, Kinetic, Rolling and Laws of Friction) NEET Questions

Physics - Laws of Motion

Friction (Static, Kinetic, Rolling and Laws of Friction) MCQ Questions


7.
What happens when the applied force exceeds the limiting friction?
A.
The object remains at rest
B.
The object starts moving
C.
Friction becomes zero
D.
Friction increases
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ANSWER :
B. The object starts moving
8.
Kinetic friction is always:
A.
Equal to limiting friction
B.
More than limiting friction
C.
Less than limiting friction
D.
Independent of velocity
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ANSWER :
C. Less than limiting friction
9.
What is the SI unit of the coefficient of friction?
A.
Newton
B.
kg·m/s²
C.
No unit (dimensionless)
D.
Joule
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ANSWER :
C. No unit (dimensionless)
10.
A block of mass 4 kg is placed on a rough horizontal surface. A horizontal force of 20 N is applied to the block, and it moves with an acceleration of 0.5 m/s². The coefficient of kinetic friction between the block and the surface is: (Take g = 10 m/s²)

NEET - 2019

A.
0.1
B.
0.2
C.
0.3
D.
0.4
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ANSWER :
C. 0.3
11.
What type of friction is present in rolling objects?
A.
Static friction
B.
Kinetic friction
C.
Rolling friction
D.
Viscous friction
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ANSWER :
C. Rolling friction
12.
Why is rolling friction less than sliding friction?
A.
Less area of contact
B.
More weight distribution
C.
More interlocking of surfaces
D.
High velocity
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ANSWER :
A. Less area of contact