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The minimum force required to start pushing a body up a rough (frictional coefficient μ ) inclined plane is F1 while the minimum force needed to prevent it from sliding down, is F2. If the inclined plane makes an angle θ with the horizontal such that tan θ=2μ, then the ratio F1F2 is

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Important Questions on Friction

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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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Given in the figure are two blocks A and B of weight 20 N and100 N, respectively. These are being pressed against a wall by a force F as shown. If the coefficient of friction between the blocks is 0.1 and between the block B and the wall is0.15, the frictional force applied by the wall on the block B is:

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Two masses m1=5 kg and m2=10 kg connected by an inextensible string over a frictionless pulley are moving as shown in the figure. The coefficient of friction of horizontal surface is 0.15. The minimum weight m that should be put on top of m2 to stop the motion is,

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A block of mass 10 kg is kept on a rough inclined plane as shown in the figure. A force of 3 N is applied on the block. The coefficient of static friction between the plane and the block is 0.6. What should be the minimum value of force P such that the block does not move downward? (Take, g=10 m s-2.)

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A block kept on a rough inclined plane, as shown in the figure, remains at rest upto a maximum force 2 N down the inclined plane. The maximum external force up the inclined plane that does not move the block is 10 N. The coefficient of static friction between the block and the plane is (take, g=10 m s-2),

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The upper portion of an inclined plane of inclination α is smooth and the lower portion is rough. A particle slides down from the top and just comes to rest at the foot. If the ratio of the smooth length to rough length is m:n, then the coefficient of friction is:
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Starting from rest, a flat car is given a constant acceleration, ao=2 m s-2. A cable is connected to a crate A of mass 50 kg as shown. Neglect the friction between the floor and car wheels and mass of pulley. Calculate the corresponding tension in the cable. The coefficient of friction between crate and floor of the car is μ=0.3. The tension in cable is,

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MEDIUM
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The coefficient of friction between 4 kg and 5 kg blocks is 0.2 and between 5 kg block and ground is 0.1, respectively. Choose the correct statements.

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