CBSE Class 11 Laws of Motion Worksheet C

Read and download free pdf of CBSE Class 11 Laws of Motion Worksheet C. 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- The minimum velocity (in ms–1) with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is : 
(a) 60
(b) 30
(c) 15
(d) 25
Ans-(b)
 
Question- A light string passing over a smooth light pulley connects two blocks of masses m1 and m2 (vertically). If the acceleration of the system is g/8, then the ratio of the masses is : 
(a) 8 : 1
(b) 9 : 7
(c) 4 : 3
(d) 5 : 3
Ans-(b)
 
Question- A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N,when the lift is stationary. If the lift moves downward with an acceleration of 5 ms–2, the reading of the spring balance will be :
(a) 24 N
(b) 74 N
(c) 15 N
(d) 49 N
Ans- (a)
 
Question- When forces F1, F2, F3 are acting on a particle of mass m such that F2 and F3 are mutually perpendicular, then the particle remains stationary. If the forces F1 is now removed, then the acceleration of the particle is 
(a) F1/m
(b) F2 F3/mF1
(c) (F2- F3)/m
(d)F2/m
Ans-(a)
 
Question- A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively 
(a) g, g
(b) g – a, g – a
(c) g – a, g
(d) a, g
Ans-(c)
 
Question- Two forces are such that the sum of their magnitudes is 18 N and their resultant which has magnitude 12 N, is perpendicular to the smaller force. Then the magnitude of the forces are :
(a) 12 N, 6 N
(b) 13 N, 5 N
(c) 10 N, 8 N
(d) 16 N, 2 N
Ans-(b)
 
Question- A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is : 
(a) Both the scales read M kg each
(b) The scale of the lower one reads M kg and of the upper one zero
(c) The reading of the two scale can be anything but the sum of the readings will be M kg
(d) Both the scale read M/2 kg
Ans-(a)

Question- A rocket with a lift-off mass 3.5 × 104 kg is blasted upwards with an initial acceleration of 10 ms–2. Then the initial thrust of the blast is : 
(a) 3.5 × 105 N
(b) 7.0 × 105 N
(c) 14.0 × 105 N
(d) 1.75 × 105 N
Ans-(a)
 
Question- A machine gun fires a bullet of mass 40 g with a velocity 1200 ms–1. The man holding it, can exert a maximum force of 144 N on the gun. How many bullets can be fire per second at the most ? 
(a) 1
(b) 4
(c) 2
(d) 3
Ans-(d)
 
Question- 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 block (in kg) is (g = 10 m/s2)
(a) 2.0
(b) 4.0
(c) 1.6
(d) 2.5
Ans-(a)
 
Question- A particle of mass 0.3 kg is subjected to a force F = – kx with k = 15 Nm–1. What will be its initial accleration, if it is released from a point 20 cm away the origin ? 
(a) 3 ms–2
(b) 15 ms–2
(c) 5 ms–2
(d) 10 ms–2
Ans-(d)
 
Question- Consider a car moving on a straight road with a speed of 100 ms–1. The distance at which car can be stopped, is [µk = 0.5]
(a) 800 m
(b) 1000 m
(c) 100 m
(d) 400 m
Ans-(b)
 
Question- The upper half of an inclined plane with inclination  is perfectly smooth, while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom, if the coefficient of friction for the lower half is given by 
(a) 2 sin Φ
(b) 2 cos Φ
(c) 2 tan Φ
(d) tan Φ
Ans-(c)
 
Question- A player caught a cricket ball of mass 150 g moving at a rate of 20 m/s. If the catching process is completed in 0.1 s,the force of the blow exerted by the ball on the hand of the player is equal to 
(a) 150 N
(b) 3 N
(c) 30 N
(d) 300 N
Ans-(c)
 
Question- 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:
(a) 30 N
(b) 25 N
(c) 27 N
(d) 48 N
Ans-(c)
 
Question- A 4 g bullet is fired horizontally with a speed of 300m/s into 0.8 kg block of wood at rest on a table. If the coefficient of friction between the block and the table is 0.3, how far will the block slide approximately?
(a) 0.379 m
(b) 0.569 m
(c) 0.758 m
(d) 0.19 m
Ans-(a)
 
Question- A rocket is fired vertically from the earth with an acceleration of 2g, where g is the gravitational acceleration.On an inclined plane inside the rocket, making an angle θ with the horizontal, a point object of mass m is kept. The minimum coefficient of friction μmin between the mass and the inclined surface such that the mass does not move is: 
(a) tan θ
(b) 2 tan θ
(c) 3 tan θ 
(d) tan 2 θ
Ans-(a)
 
Question- A body of mass 2kg slides down with an acceleration of 3 m/s2 on a rough inclined plane having slope of 300. The external force required to take the same body up the plane with the same acceleration will be: (g = 10 m/s2)
(a) 14 N
(b) 20 N
(c) 6 N
(d) 4 N
Ans-(b)
 
Question- A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block is (2003)
(a) Pm/M+m
(b)Pm/M-m
(c) P
(d)PM/M+m
Ans-(d)
 
Question- A block of mass m is placed on a surface with a vertical cross section given by y-x3/6 . If the coefficient of friction is 0.5, the maximum height above the ground at which the block can be placed without slipping is :
(a)2/3 m
(b)1/3 m
(c)1/2 m
(d)1/6 m
Ans-(d)

 

More question-


1. Why is it desired to hold a gun tight to one’s shoulder when it is being fired?

2. Why does a swimmer push the water backwards?

3. Friction is a self adjusting force. Justify.

4. A force is being applied on a body but it causes no acceleration. What possibilities may be considered to explain the observation?

5. Force of 16N and 12N are acting on a mass of 200kg in mutually perpendicular directions. Find the magnitude of the acceleration produced?

6. An elevator weighs 3000kg. What is its acceleration when the in the tension supporting cable is 33000N. Given that g = 9.8m/s2.

7. Write two consequences of Newton’s second law of motion?

8. How is centripetal force provided in case of the following?

(i) Motion of planet around the sun,

(ii) Motion of moon around the earth.

(iii) Motion of an electron around the nucleus in an atom.

9. State Newton’s second, law of motion. Express it mathematically and hence obtain a relation between force and acceleration.

10. A railway car of mass 20 tonnes moves with an initial speed of 54km/hr. On applying brakes, a constant negative acceleration of 0.3m/s2 is produced.

(i) What is the breaking force acting on the car?

(ii) In what time it will stop? 

(iii) What distance will be covered by the car before if finally stops?  


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CBSE Class 11 Physics Chapter 5 Laws of Motion Worksheet

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