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A box of mass 8 kg is placed on a rough inclined plane of inclination 30o. Its downward motion can be prevented by applying a horizontal force F, then value of F for which friction between the block and the incline surface is minimum, is

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Important Questions on Laws of Motion

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General Science>Physics>Laws of Motion>Friction
Which of the following is a self adjusting force?
MEDIUM
General Science>Physics>Laws of Motion>Friction
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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EASY
General Science>Physics>Laws of Motion>Friction
Which one of the following statements is incorrect?
EASY
General Science>Physics>Laws of Motion>Friction
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 :
MEDIUM
General Science>Physics>Laws of Motion>Friction

A brick of mass 2 kg slides down an incline of height 5 m and angle 30°. If the coefficient of friction of the incline is 123, the velocity of the block at the bottom of the incline is (Assume the acceleration due to gravity is 10 m/s2)

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General Science>Physics>Laws of Motion>Friction
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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:
MEDIUM
General Science>Physics>Laws of Motion>Friction
When a body is placed on a rough plane (coefficient of friction=μ) inclined at an angle θ to the horizontal, its acceleration is (acceleration due to gravity =g)
EASY
General Science>Physics>Laws of Motion>Friction
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)
MEDIUM
General Science>Physics>Laws of Motion>Friction
A body of mass m is launched up on a rough inclined plane making an angle of 30° with the horizontal. The coefficient of friction between the body and plane is x5, if the time of ascent is half of the time of descent. The value of x is
MEDIUM
General Science>Physics>Laws of Motion>Friction
The normal reaction N for a vehicle of 800 kg mass, negotiating a turn on a 30° banked road at maximum possible speed without skidding is ____ ×103 kg m s-2.
EASY
General Science>Physics>Laws of Motion>Friction
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
MEDIUM
General Science>Physics>Laws of Motion>Friction

A block of mass 5 kg is kept against an accelerating wedge with a wedge angle of 45° to the horizontal. The co-efficient of friction between the block and the wedge is μ=0.4. What is the minimum absolute value of the acceleration of the wedge to keep the block steady. Assume g=10 m s-2

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General Science>Physics>Laws of Motion>Friction
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
MEDIUM
General Science>Physics>Laws of Motion>Friction
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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General Science>Physics>Laws of Motion>Friction
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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General Science>Physics>Laws of Motion>Friction
Which of the following surface in contact has maximum coefficient of friction μ?
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General Science>Physics>Laws of Motion>Friction
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)
MEDIUM
General Science>Physics>Laws of Motion>Friction
If a block of mass ' m ' placed on a plane inclined at an angle θ, is on the verge of sliding, then the coefficient of friction between the block and the plane is given by
EASY
General Science>Physics>Laws of Motion>Friction
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
HARD
General Science>Physics>Laws of Motion>Friction
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 )