EASY
11th ICSE
IMPORTANT
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When a bicycle is in motion, the force of friction exerted by the ground on the two wheels acts:

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Important Questions on Friction

MEDIUM
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 12
A 2 kg block is placed on a rough surface inclined at  30° with the horizontal. If the coefficient of friction be 0.5, the limiting frictional force acting on the block will be:
MEDIUM
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 13
Lubricants cannot reduce:
EASY
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 14
Polishing the surfaces in contact beyond a limit increases friction because:
MEDIUM
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 15
A block of base 10 cm×10 cm and height 15 cm is kept on an inclined plane. The coefficient of friction between them is 3. The inclination θ of this inclined plane from the horizontal plane is gradually increased from 0°. Then 
MEDIUM
11th ICSE
IMPORTANT
ISC Physics Class XI Part 1>Chapter 11 - Friction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 16
A block of mass m is on an inclined plane of angle θ. The coefficient of friction between the block and the plane is  μ and  tanθ>μ. The block is held stationary by applying a force F parallel to the plane. The direction of force pointing up the plane is taken to be positive. As Fis varied fromF1=mg sinθ-μcosθ to F2=mg sinθ+μcosθ the frictional force f versus F graph will look like: