1.
Which of the following is correct, when a person walks on a rough surface
2.
A block of mass 10 kg is placed on an inclined plane. When the angle of inclination is 30o, the block just begins to slide down the plane. The force of static friction is
3.
A train consisting of 30 wagons and each ones mass is given to us. The power of the engine pulling the train is also given to us in the problem. Frictional force per each tonne is given as 12 newton and we need to measure the maximum velocity of the train
4.
A 2 kg mass starts from rest on an inclined smooth surface with inclination 30o and length 2 m. How much will it travel before coming to rest on a frictional surface with frictional coefficient of 0.25
5.
When a bicycle is being pedalled, the frictional forces exerted by the ground are
6.
When a bicycle is in motion but not pedalled, the force of friction exerted by the ground on the two wheels is such that it acts
7.
A wooden block of mass 100 Kg is kept on a horizontal platform. A force of 60 N is required to just slide the block. But a force of 49N is just sufficient to keep the block.moving with uniform velocity. What is the coefficient of kinetic friction?
8.
A block weighs W is held against a vertical wall by applying a horizontal force F. The minimum value of F needed to hold the block is
9.
A force of 98 N is required to just start moving a body of mass 100 kg over ice. The coefficient of static friction is
10.
Pulling force making an angle θ to the horizontal is applied on a block of weight W placed on a horizontal table. If the angle of friction is α, then the magnitude of force required to move the body is equal to
11.
A uniform rope of length ℓ lies on a table if the coefficient of friction is μ , then the maximum length ℓ 1 of the part of this rope which can over hang from the edge of the table without sliding down is
12.
A block of 1 kg is stopped against a wall by applying a force F perpendicular to the wall. If μ=0.2 then minimum value of F will be
13.
Work done by a frictional force is
14.
A 20 kg block is initially at rest on a rough horizontal surface. A horizontal force of 75 N is required to set the block in motion. After it is in motion, a horizontal force of 60 N is required to keep the block moving with constant speed. The coefficient of static friction is
15.
Which one of the following is not used to reduce friction
16.
A lift is moving downwards with an acceleration equal to acceleration due to gravity. A body of mass m kept on the floor of the lift is pulled horizontally. If the coefficient of friction is m, then the frictional resistance offered by the body is
17.
If a ladder weighing 250 N is placed against a smooth vertical wall having coefficient of friction between it and floor is 0.3, then what is the maximum force of friction available at the point of contact between the ladder and the floor
18.
A block of mass 1 kg slides down on a rough inclined plane of inclination 60o starting from its top. If the coefficient of kinetic friction is 0.5 and length of the plane is 1 m, then work done against friction is (Take g = 9.8 m/s2)
19.
A box is placed on an inclined plane and has to be pushed down. The angle of inclination is
20.
A cylinder of mass 10 kg is sliding on a plane with an initial velocity of 10 m/s. If coefficient of friction between surface and cylinder is 0.5 , then before stopping it will travel a distance of
21.
A body of mass 5 kg rests on a rough horizontal surface of coefficent of friction 0.2. The body is pulled through a distance of 10m by a horizontal force of 25 N. The kinetic energy acquired by it is ( g = 10 m/s^2 )
22.
A car having a mass of 1000 Kg is moving at a speed of 30 meters/sec. Brakes are applied to bring the car to rest.If the frictional force between the tyres and the road surface is 5000 newtons,the car will come to rest in
23.
A vehicle of mass m is moving on a rough horizontal road with momentum P. If the coefficient of friction between the tyres and the road be , then the stopping distance is
24.
A 500kg horse pulls a cart of mass 1500kg along a level road with an acceleration of 1m/s 2 . If the coefficient of sliding friction 0.2. The horizontal force exerted by the earth on the horse is
25.
The limiting friction is
Nice platform for self evaluation
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Good for practice