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The ratio of the limiting force at friction- F to the normal reaction-R is known as

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Important Questions on Friction

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Friction can be reduced by changing from
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A thin motorcyclist rides with sufficient speed in the vertical plane inside a hollow sphere of diameter 20 m to prevent himself from sliding down. If the coefficient of friction is 0.5, then what is the minimum speed of the motor cyclist? (use g=10 m s-2)
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Frictional forces act in a direction
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Which of the following is a self adjusting force?
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A block is released from rest on a 45° smooth incline and slide a distance d. The time taken to slide the same distance is n times as much to slide on a 45° rough incline than on the smooth incline. The coefficients of friction for the rough incline is
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Which one of the following statements is incorrect?
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Which of the following surface in contact has maximum coefficient of friction μ?
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A box when dropped from a certain height reaches the ground with a speed v . When it slides from rest from the same height down a rough inclined plane inclined at an angle 45o to the horizontal, it reaches the ground with a speed v3 . The coefficient of sliding friction between the box and the plane is (acceleration due to gravity is 10 m s-2 )
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A block rests on a rough inclined plane making an angle of 30° with the horizontal. The coefficient of static friction between the block and the plane is 0.8 . If the frictional force on the block is 10 N, the mass of the block is g=10 m s-2
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Meena applies the front brakes while riding on her bicycle along a flat road. The force that slows her bicycle is provided by the
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A car is negotiating a curved road of radius R . The road is banked at an angle θ. The coefficient of friction between the tyres of the car and the road is μs. The maximum safe velocity on this road is:
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A block A of mass 4 kg is placed on another block B of mass 5 kg, and the block B rests on a smooth horizontal table. If the minimum force that can be applied on A so that both the blocks move together is 12 N, the maximum force that can be applied on B for the blocks to move together will be :
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A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches 30°, the box starts to slip and slides 4.0 m down the plank in 4.0 s. The coefficients of static and kinetic friction between the box and the plank will be, respectively:
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A block of mass 10 kg starts sliding on a surface with an initial velocity of 9.8 ms-1. The coefficient of friction between the surface and block is 0.5. The distance covered by the block before coming to rest is :[use g=9.8 ms-2]
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A block A of mass m1 rests on a horizontal table. A light string connected to it passes over a frictionless pulley at the edge of table and from its other end another block B of mass m2 is suspended. The coefficient of kinetic friction between the block and the table is μk. When the block B is sliding on the table, the tension in string is:
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A block of mass m is placed on a surface with a vertical cross section given by y=x36. If the coefficient of friction is 0.5, the maximum height above the ground at which the block can be placed without slipping is 
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A small box resting on one edge of the table is struck in such a way that it slides off the other edge, 1 m away, after 2 seconds. The coefficient of kinetic friction between the box and the table
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A block placed on the horizontal is pushed momentarily with initial velocity v. The coefficient of friction between the block and surface is μ. Block will come to rest after a time t equal to (g= acceleration due to gravity)
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A body of mass 2 kg is kept by pressing to a vertical wall by a force of 100 N. The friction between wall and body is 0.3. Then the frictional force is equal to
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Given in the figure are two blocks A and B of weight 20 N and 100 N, respectively. These are being pressed against a wall by a force F and kept in equilibrium as shown. If the coefficient of friction between the blocks is 0.1 and between block B and the wall is 0.15, the frictional force applied by the wall on block B is: