CBSE Class 11 Laws of Motion Worksheet D

Read and download free pdf of CBSE Class 11 Laws of Motion Worksheet D. Download printable Physics Class 11 Worksheets in pdf format, CBSE Class 11 Physics Chapter 5 Laws of Motion Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Physics Class 11 Assignments and practice them daily to get better marks in tests and exams for Class 11. Free chapter wise worksheets with answers have been designed by Class 11 teachers as per latest examination pattern

Chapter 5 Laws of Motion Physics Worksheet for Class 11

Class 11 Physics students should refer to the following printable worksheet in Pdf in Class 11. This test paper with questions and solutions for Class 11 Physics will be very useful for tests and exams and help you to score better marks

Class 11 Physics Chapter 5 Laws of Motion Worksheet Pdf

Law of Motion MCQ Questions with Answers Class 11 Physics Chapter 5

Question- A mass of 3 kg descending vertically downward supports a mass of 2 kg by means of a light string passing over a pulley. At the end of 5 s the string breaks. How much high from now the 2 kg mass will go ? (g = 9.8 m/s2)
(a) 4.9 m
(b) 9.8 m
(c) 16.9 m
(d) 2.45 m
Ans-(a)
 
Question- When a bird of weight W sits on a stretched wire, the tension T in the wire is
(a) > W/2
(b) = W
(c) < W
(d) None of these
Ans-(a)
 
Question- A person swimming in a fresh water pool is obeying :
(a) Newton’s second law
(b) Gravitational law
(c) Newton’s third law
(d) Newton’s first law
Ans-(c) 
 
Question- The passenger move forward when train stops, due to :
(a) inertia of passenger
(b) inertia of train
(c) gravitation pull by earth
(d) none of the above
Ans- (a)
 
Question- Tension in the cable supporting an elevator, is equal to the weight of the elevator. From this, we can conclude that the elevator is going up or down with a
(a) uniform speed
(b) uniform acceleration
(c) variable acceleration
(d) either (b) and (c).
Ans- (a)
 
Question- An automobile enters a turn whose radius is R. The road is banked at angle θ. Friction is negligible between the wheels of the automobile and road. Mass of the automobile is m and speed is u. Select the correct alternative :
(a) net force on the automobile is zero
(b) normal reaction on the automobile is mg cos θ
(c) normal reaction on the automobile is mg sec θ
(d) none of the above
Ans-(c)

Question- A force of 100 N need to be applied parallel to a smooth inclined plane just to hold a body on it. The angle of inclination of the inclined plane is 30°. How much horizontal force need to be applied to do the same ?
(a) 50 N
(b) 87 N
(c) 100 N
(d) 115 N
Ans-(d) 
 
Question-The engine of a car produces acceleration of 4 m/s2 in car. If this car pulls another car of same mass, what will be the acceleration produced ?
(a) 8 m/s2
(b) 2 m/s2
(c) 4 m/s2
(d)1/2m/s2
Ans-(b) 
 
Question- A man has weight 80 N. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5 m/s2. What would be the reading on the scale ?
(g = 10 m/s2)
(a) 800 N
(b) 120 N
(c) zero
(d) 400 N
Ans-(b) 
 
Question- A trolley car slides down a smooth inclined plane of angle of inclination θ. If a body is suspended from the roof of the trolley car by an inextensible string, the corresponding tension in the string will be :
(a) mg
(b) mg cos θ
(c) mg sin θ 
(d) zero
Ans-(b) 
 
Question- A mortor cycle and a car are moving on a horizontal road with the same velocity. If they are brought to rest by the application of brakes, which provided equal retardation, then
(a) motor cycle will stop at shorter distance
(b) car will stop at a shorter distance
(c) both will stop at the same distance
(d) nothing can be predicted.
Ans-(c) 
 
Question- A car is moving in a circular horizontal track of radius 10 m with a constant speed of 10 m/s. A plumb bob is suspended from the roof of the car by a light rigid rod. The angle made by the bob with the vertical is (g = 10 m/s2)
(a) zero
(b) 30o
(c) 45o
(d) 60o
Ans-(c)
 
Question- The rear side of a truck is open and a box of mass 20 kg is placed on the truck 4 m away from the open end. µ = 0.15 and g = 10 m/s2. The truck starts from rest with an acceleration of 2 m/s2 on a straight road. The box will fall off the truck when it is at a distance from the starting point equal to :
(a) 4 m
(b) 8 m
(c) 16 m
(d) 32 m
Ans-(c)
 
Question- A rough vertical board has an acceleration a along the horizontal, so that a block of mass M pressing against it does not fall. The coefficient of friction between block and the board is :
(a) > a/g
(b) < g/a
(c) < a/g
(d) > g/a
Ans-(d)
 
Question- During paddling of a bicycle, the force of friction exerted by the ground on the two wheels is such that it acts.
(a) in the backward direction on the front wheel and in the forward direction on the rear wheel
(b) in the forward direction on the front wheel and in the backward direction on the rear wheel
(c) in the backward direction on both the front and the rear wheels
(d) in the forward direction on both the front and the rear wheels
Ans-(a)
 
Question- A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5 N on the block. If the coefficient of friction between the block and the wall is 0.5, the magnitude of the frictional force acting on the block is
(a) 2.5 N
(b) 0.98 N
(c) 4.9 N
(d) 0.49 N
Ans-(b)
 
Question-Which of the following are correct ?
(a) A parachute of weight W strikes the ground with his legs and comes to rest with an upwar acceleration of magnitude 3g. Force exerted on him by ground during landing is 4 W.
(b) Two massless spring balances are hung vertically in series from a fixed point and a mass M kg is attached to the lower end of the lower spring balance. Each spring balance reads M kg.
(c) A rough vertical board has an acceleration a along the horizontal direction so that a block of mass m passing against it does not fall. The coefficient of friction between the block and the board is greater than g/a.
(d) A man is standing at a spring platform. If man jumps away from the platform the reading of the spring balance first increases and then decreases to zero.
Ans-(a,b,c,d)
 
Question- Maximum force F0 exerted by the bat on the ball is
(a) 4,000 N
(b) 5,000 N
(c) 3,000 N
(d) 2,500 N
Ans-(a)
 
Question- Average force exerted by the bat on the ball is
(a) 5,000 N
(b) 2,000 N
(c) 2,500 N
(d) 6,000 N
Ans-(b)
 
Question- What is the speed of the ball at the instant the force acting on it is maximum ?
(a) 40 m/s
(b) 30 m/s
(c) 20 m/s
(d) 10 m/s
Ans-(c)


More question-


1. What is the unit of coefficient of friction?

2. Name the factor on which coefficient of friction depends?

3. What provides the centripetal force to a car taking a turn on a level road?

4. Give the magnitude and direction of the net force acting on

(a) A drop of rain falling down with constant speed.

(b) A kite skillfully held stationary in the sky.

5. Two blocks of masses m1, m2 are connected by light spring on a smooth horizontal surface. The two masses are pulled apart and then released. Prove that the ratio of their acceleration is inversely proportional to their masses.

6. A shell of mass 0.020kg is fired by a gun of mass 100kg. If the muzzle speed of the shell is 80m/s, what is the recoil speed of the gun?

7. A train runs along an unbanked circular bend of radius 30m at a speed of 54km/hr. The mass of the train is 106kg. What provides the necessary centripetal force required for this purpose? The engine or the rails? What is the angle of banking required to prevent wearing out of the rail?

8. Three identical blocks each having a mass m, are pushed by a force F on a frictionless table as shown in figure

CBSE Class 11 Laws of Motion Worksheet D

What is the acceleration of the blocks? What is the net force on the block P? What force does P apply on Q. What force does Q apply on R?

9. (a) Define impulse. State its S.I. unit?

(b) State and prove impulse momentum theorem? 


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