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A force of 12 N is required to start a uniform plank of wood sliding on a bench for which coefficient of friction is constant. The plank is cut into three equal pieces and these pieces are stacked one above the other. The force now needed to start movement of pile would be

4 N

12 N

24 N

36 N

A block resting on an inclined plane begins to slide down the plane when the angle of inclination is gradually increased to 30 degree. Then the coefficient of friction between the block and plane is

0.50

0.578

0.72

0.866

A body starts rolling down on an inclined plane (angle of plane = 30°) the top half of which is perfectly smooth and the lower half rough. If the body is brought to rest before it reaches the bottom, the ratio of the force of friction and weight of body (F/W) is

0.5

1

2

4

When a bicycle in motion is being pedaled, the force of friction exerted be the ground on the wheels is such that it acts

in the backward direction on the front wheel and in the forward direction on the rear wheel

in the forward direction on the front wheel and in the backward direction on the rear wheel

in the backward direction on both the front and rear wheels

in the forward direction on both the front and rear wheels.

Mark the wrong statement:

The maximum force of friction is independent of the magnitude of area in contact between the surfaces

Coefficient of friction between two surfaces is a constant of proportionality between the limiting force of the friction and the normal reaction

The coefficient of static friction must be less than the coefficient of dynamic friction for a given pair of bodies

If a block slides over an inclined plane, the reaction by the plane on the block may not be in line with the weight force

A 44 N block is thrust up a 30 degree inclined plane with an initial speed of 5 m/s. It travels a distance of 1.5 m before it comes to rest. The frictional force acting upon it would be

9.5 N

12.6 N

15.3 N

18.7 N

A man holds a book weighing 10 N between hands and keeps it free from falling by pressing both hands against the book with a force of 25 N each. The coefficient of friction between the block and hand would be

0.1

0.2

0.4

0.8

A zero angle of friction implies that

frictional force is infinite

frictional force is zero

frictional force acts normal to the plane

frictional force acts along the direction of motion.

A car is traveling at 90 km/hr on a rough road and the coefficient of friction between the road surface and the car tires is 0.5. At which distance the car will stop when the brakes are jammed suddenly? Take g = 10 m/s2

37.8 m

45.6 m

62.5 m

70.2 m

A uniform flexible rope of length 60 m is partly lying on a rough table and is partly just hanging across the edge of the table. If the coefficient of friction between the table and rope is 0.2, the maximum length of rope which can just hang is

10 m

15 m

25 m

40 m

A box is given a push along a surface on which it rests, with a velocity of 6 m/s. If it stops after covering a distance of 5 m, the coefficient of friction between the box and the surface is

0.24

0.36

0.45

0.58

Brakes are applied to a car traveling at 90 km/ hr and it comes to stop 5 seconds there-after. The coefficient of friction between the wheels and road surface is Take g = 10 m/s2

0.18

0.25

0.36

0.5

4 N

12 N

24 N

36 N

A block resting on an inclined plane begins to slide down the plane when the angle of inclination is gradually increased to 30 degree. Then the coefficient of friction between the block and plane is

0.50

0.578

0.72

0.866

A body starts rolling down on an inclined plane (angle of plane = 30°) the top half of which is perfectly smooth and the lower half rough. If the body is brought to rest before it reaches the bottom, the ratio of the force of friction and weight of body (F/W) is

0.5

1

2

4

When a bicycle in motion is being pedaled, the force of friction exerted be the ground on the wheels is such that it acts

in the backward direction on the front wheel and in the forward direction on the rear wheel

in the forward direction on the front wheel and in the backward direction on the rear wheel

in the backward direction on both the front and rear wheels

in the forward direction on both the front and rear wheels.

Mark the wrong statement:

The maximum force of friction is independent of the magnitude of area in contact between the surfaces

Coefficient of friction between two surfaces is a constant of proportionality between the limiting force of the friction and the normal reaction

The coefficient of static friction must be less than the coefficient of dynamic friction for a given pair of bodies

If a block slides over an inclined plane, the reaction by the plane on the block may not be in line with the weight force

A 44 N block is thrust up a 30 degree inclined plane with an initial speed of 5 m/s. It travels a distance of 1.5 m before it comes to rest. The frictional force acting upon it would be

9.5 N

12.6 N

15.3 N

18.7 N

A man holds a book weighing 10 N between hands and keeps it free from falling by pressing both hands against the book with a force of 25 N each. The coefficient of friction between the block and hand would be

0.1

0.2

0.4

0.8

A zero angle of friction implies that

frictional force is infinite

frictional force is zero

frictional force acts normal to the plane

frictional force acts along the direction of motion.

A car is traveling at 90 km/hr on a rough road and the coefficient of friction between the road surface and the car tires is 0.5. At which distance the car will stop when the brakes are jammed suddenly? Take g = 10 m/s2

37.8 m

45.6 m

62.5 m

70.2 m

A uniform flexible rope of length 60 m is partly lying on a rough table and is partly just hanging across the edge of the table. If the coefficient of friction between the table and rope is 0.2, the maximum length of rope which can just hang is

10 m

15 m

25 m

40 m

A box is given a push along a surface on which it rests, with a velocity of 6 m/s. If it stops after covering a distance of 5 m, the coefficient of friction between the box and the surface is

0.24

0.36

0.45

0.58

Brakes are applied to a car traveling at 90 km/ hr and it comes to stop 5 seconds there-after. The coefficient of friction between the wheels and road surface is Take g = 10 m/s2

0.18

0.25

0.36

0.5

Questions are on friction on inclined plane, plane surface and some conceptual as well. Gives good practice for students of XI PHYSICS. AIEEE Physics, AIPMT, IIT JEE

nice questios but we need the solutions of the answers so we can know better.

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