The block will remain at rest on the plane upto certain θ and then it will topple

At θ = 300, the block will start sliding down the plan

At θ = 600, the block will start sliding down the plane and continue to do so at higher angles

At θ = 600, the block will start sliding down the plane and on further increasing 0, it will topple at certain θ

JEE Questions for Physics Laws Of Motion Quiz 7

A uniform metal chain is placed on a rough table such that one end of chain hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is

0%
0%
2)
0%
0%

Which of the following statements is not true?

0%
The coefficient of friction between two surfaces increases as the surface in contact are made rough
0%
The force of friction acts in a direction opposite to the applied force
0%
Rolling friction is greater than sliding friction
0%
The coefficient of friction between wood and wood is less than 1.

A heavy uniform chain lies on a horizontal table-top. If the coefficient of friction between the chain and table surface is 0.25, then the maximum fraction of length of the chain, that can hang over one edge of the table is

0%
20%
0%
25%
0%
35%
0%
15%

Work done by a frictional force is

0%
Negative
0%
Positive
0%
Zero
0%
All of these

A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is
Physics-Laws of Motion-77034.png

0%
2 N
0%
20 N
0%
50 N
0%
100 N

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

0%
0.38
0%
0.44
0%
0.52
0%
0.60

A block A with mass 100 kg is resting on another block B of mass 200 kg. As shown in figure a horizontal rope tied to a wall holds it. The coefficient of friction between A and 13 is 0.2 while coefficient of friction between B and the ground is 0.3. The minimum required force F to start moving B will be
Physics-Laws of Motion-77037.png

0%
900 N
0%
100 N
0%
1100 N
0%
1200 N

To avoid slipping while walking on ice, one should take smaller steps because of the

0%
Friction of ice is large
0%
Larger normal reaction
0%
Friction of ice is small
0%
Smaller normal reaction

A box is lying on an inclined plane what is the coefficient of static friction if the box starts sliding when an angle of inclination is 60^o

0%
1.173
0%
1.732
0%
2.732
0%
1.677

A block of mass 2 kg is kept on the floor. The coefficient of static friction is 0.4. If a force F of 2.5 Newtons is applied on the block as shown in the figure, the frictional force between the block and the floor will be
Physics-Laws of Motion-77040.png

0%
2.5 N
0%
5 N
0%
7.84 N
0%
10 N

Which one of the following is not used to reduce friction?

0%
Oil
0%
Ball bearings
0%
Sand
0%
Graphite

A body of mass 2 kg is kept by pressing to a vertical wall by a force of 100 N. The coefficient of friction between wall and body is 0.3. Then the frictional force is equal

0%
6 N
0%
20 N
0%
600 N
0%
700 N

A boy of mass 40 kg is climbing a vertical pole at a constant speed. If the coefficient of friction between his palms and the pole is 0.8 and g = 10 m/s², the horizontal force that he is applying on the pole is

0%
300 N
0%
400 N
0%
500 N
0%
600 N

0%
zero
0%
15 kJ
0%
5 kJ
0%
10 kJ

The maximum speed that can be achieved without skidding by a car on a circular unbanked road of radius R and coefficient of static friction µ, is

0%
0%
2)
0%
0%

A car is moving along a straight horizontal road with a speed v_o. lithe coefficient of friction between the tyres and the road is µ, the shortest distance in which the car can be stopped is

0%
0%
2)
0%
0%

A block of mass 5 kg is on a rough horizontal surface and is at rest. Now a force of 24 N is imparted to it with negligible impulse. If the coefficient of kinetic friction is 0.4 and g = 9.8 m/s², then the acceleration of the block is

0%
0.26 m/s2
0%
0.39 m/s2
0%
0.69 m/s2
0%
0.88 m/s2

A body B lies on a smooth horizontal table and another body A is placed on B. The coefficient of friction between A and B is µ. What acceleration given to B will cause slipping to occur between A and B

0%
0%
2)
0%
0%

A car turns a corner on a slippery road at a constant speed of 10 m/s. If the coefficient of friction is 0.5, the minimum radius of the arc in meter in which the car turns is

0%
20
0%
10
0%
5
0%
4

A motorcyclist of mass m is to negotiate a curve of radius r with a speed v. The minimum value of the coefficient of friction so that this negotiation may take place safely, is

0%
0%
2)
0%
0%

A force of 20 N is applied on a body of mass 5 kg resting on a horizontal plane. The body gains a kinetic energy of 10 joule after it moves a distance 2 m. The frictional force is

0%
10 N
0%
15 N
0%
20 N
0%
30 N

A block of mass 50 kg can slide on a rough horizontal surface. The coefficient of friction between the block and the surface is 0.6. The least force of pull acting at an angle of 30^o to the upward drawn vertical which causes the block to just slide is

0%
29.43 N
0%
219.6 N
0%
21.96 N
0%
294.3 N

A body of 10 kg is acted by a force of 129.4 N. If g = 9.8 m/s². The acceleration of the block is 10 m/s². What is the coefficient of kinetic friction?

0%
0.03
0%
0.01
0%
0.30
0%
0.25

Force required to move a mass of 1 kg at rest on a horizontal rough plane (µ = 0.1 and g = 9.8 m/s²) is

0%
0.98 N
0%
0.49 N
0%
9.8 N
0%
4.9 N

Consider a car moving along a straight horizontal road with a speed of 72 km/h. If the coefficient of kinetic friction between the tyres and the road is 0.5, the shortest distance in which the car can be stopped is [g = 10 m/s²)

0%
30 m
0%
40 m
0%
72 m
0%
20 m

A 500 kg horse pulls a cart of mass 1500 kg along a level road with an acceleration of 1 ms^–2. If the coefficient of sliding friction is 0.2, then the force exerted by the horse in forward direction is

0%
3000 N
0%
4000 N
0%
5000 N
0%
6000 N

When a body is moving on a surface, the force of friction is called

0%
Static friction
0%
Dynamic friction
0%
Limiting friction
0%
Rolling friction

A 60 kg weight is dragged on a horizontal surface by a rope upto 2 meters. If coefficient of friction is µ = 0.5, the angle of rope with the surface is 60^o and g = 9.8 m/sec², then work done is

0%
294 J
0%
315 J
0%
588 J
0%
197 J

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

0%
5 s
0%
10 s
0%
12 s
0%
6 s

If µ_s, µ_k and µ_r are coefficients of static friction, sliding friction and rolling friction, then

0%
µs < µk < µr
0%
µk < µr < µs
0%
µr < µk < µs
0%
µr = µk = µs

A body is moving along a rough horizontal surface with an initial velocity 6 m/s. If the body comes to rest after travelling 9 m, then the coefficient of sliding friction will be

0%
0.4
0%
0.2
0%
0.6
0%
0.8

A body moves along a circular path of radius 10 m and the coefficient of friction is 0.5. What should be its angular speed in rad/s if it is not to slip from the surface (g = 9.8 ms²)

0%
5
0%
10
0%
0.1
0%
0.7

The backside of a truck is open and a box of 40 kg is placed 5 m away from the rear end. The coefficient of friction of the box with the surface of the truck is 0.15. The truck starts from rest with 2 m/s² acceleration. Calculate the distance covered by the truck when the box falls off

0%
20 m
0%
30 m
0%
40 m
0%
50 m

0%
At θ = 300, the block will start sliding down the plan
0%
The block will remain at rest on the plane upto certain θ and then it will topple
0%
At θ = 600, the block will start sliding down the plane and continue to do so at higher angles
0%
At θ = 600, the block will start sliding down the plane and on further increasing 0, it will topple at certain θ

Two blocks, 4 kg and 2 kg are sliding down an incline plane as shown in figure. The acceleration of 2 kg block is
Physics-Laws of Motion-77081.png

0%
1.66 m/s2
0%
2.65 m/s2
0%
3.66 m/s2
0%
4.66 m/s2

A block is at rest on an inclined plane making an angle α with the horizontal. As the angle α of the incline is increased, the block starts slipping when the angle of inclination becomes θ. The coefficient of static friction between the block and the surface of the inclined plane is or A body starts sliding down at an angle θ to horizontal. Then coefficient of friction is equal to

0%
sin θ
0%
cos θ
0%
tan θ
0%
Independent of θ

The force required just to move a body up an inclined plane is double the force required just to prevent the body sliding down. If the coefficient of friction is 0.25, the angle of inclination of the plane is

0%
36.8o
0%
45o
0%
30o
0%
42.6o

A box is placed on an inclined plane and has to be pushed down. The angle of inclination is

0%
Equal to angle of friction
0%
More than angle of friction
0%
Equal to angle of repose
0%
Less than angle of repose

A force of 750 N is applied to a block of mass 102 kg to prevent it from sliding on a plane with an inclination angle 30^o with the horizontal. If the coefficients of static friction and kinetic friction between the block and the plane are 0.4 and 0.3 respectively, then the frictional force acting on the block is

0%
750 N
0%
500 N
0%
345 N
0%
250 N

An ice cube is kept on an inclined plane of angle 30^o. Coefficient of kinetic friction between block and incline plane is l/√3 What is acceleration of block?

0%
zero
0%
2 ms/2
0%
1.5 ms/2
0%
5 ms/2

A body of mass 100 g is sliding from an inclined plane of inclination 30°. What is the frictional force experienced if µ = 1.7?

0%
0%
2)
0%
0%

A block is kept on an inclined plane of inclination θ of length l. The velocity of particle at the bottom of inclined plane is (the coefficient of friction is µ)

0%
0%
2)
0%
0%

A body is sliding down an inclined plane having coefficient of friction 0.5. If the normal reaction is twice that of the resultant downward force along the incline, the angle between the inclined plane and the horizontal is

0%
15o
0%
30o
0%
45o
0%
60o

A block of mass 10 kg is placed on an inclined plane. When the angle of inclination is 30°, the block just begins to slide down the plane. The force of static friction is

0%
10 kg wt
0%
89 kg wt
0%
49 kg wt
0%
5 kg wt

A 2 kg mass starts from rest on an inclined smooth surface with inclination 30^o and length 2 m. How much will it travel before coming to rest on a frictional surface with frictional coefficient of 0.25?

0%
4 m
0%
6 m
0%
8 m
0%
2 m

A block rests on a rough inclined plane making an angle of 30^o 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 (in kg) is (take g = 10 m/s²)

0%
2.0
0%
4.0
0%
1.6
0%
2.5

A body takes rime t to reach the bottom of an inclined plane of angle θ with the horizontal, If the plane is made rough, time taken now is 2t. The coefficient of friction of the rough surface is

0%
0%
2)
0%
0%

A coin of mass 10 g is placed over a book of length 50 cm. The coin is on the verge of sliding when one end of the book is lifted 10 cm up. The coefficient of static friction between the book and the coin is

0%
1.0
0%
0.4
0%
0.3
0%
0.2

An object placed on an inclined plane starts sliding when the angle of incline becomes 30^o. The coefficient of static friction between the object and the plane is

0%
0%
2)
0%
0%

A block of mass 200 kg is being pulled up by men on an inclined plane at angle of 45^o as shown. The coefficient of static friction is 0.5. Each man can only apply a maximum force of 500 N. Calculate the number of men required for the block to just start moving up the plane
Physics-Laws of Motion-77111.png

0%
10
0%
15
0%
5
0%
3

JEE Questions for Physics Laws Of Motion Quiz 7 - MCQExams.com

0:0:1

Practice Physics Quiz Questions and Answers

JEE Questions for Physics Laws Of Motion Quiz 7 - MCQExams.com

0:0:1

Practice Physics Quiz Questions and Answers

Support mcqexams.com by disabling your adblocker.