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Friction can be reduced by changing from

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Important Questions on Friction

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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 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 one of the following statements is incorrect?
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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 of the following is a self adjusting force?
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Which of the following surface in contact has maximum coefficient of friction μ?
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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 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 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 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:
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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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A block has been placed on an inclined plane with the slope angle θ, block slides down the plane at constant speed. The coefficient of kinetic friction is equal to
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The force of kinetic friction acts on the object sliding on fixed rough horizontal surface in a direction _____ to the direction of motion of object.

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The force of friction depends upon

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A block of mass 2 kg is placed on the floor. The coefficient of static friction is 0.4. If a force of 2.8 N is applied on the block parallel to floor, the force of friction between the block and floor (Taking g=10 ms-2) is
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Starting from rest, a body slides down a 45o inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The coefficient of friction between the body and the inclined plane is
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The slope of the thread with horizontal is known as