CBSE Class 11 Physics Laws of Motion Worksheet Set E

Read and download free pdf of CBSE Class 11 Physics Laws of Motion Worksheet Set E. 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

LAWS OF MOTION

SECTION – A CONCEPTUAL AND APPLICATION TYPE QUESTIONS

1. If the net force acting on the body be zero, will the body remain necessarily in rest position ? Explain your answer .

2. 1. Action and reaction forces do not balance each other . why ? 

3. 2. If a force is acting on a moving body perpendicular to the direction of motion , then what will be its effect on the speed and direction of the body ?

4. 3. Is the linear momentum of a ball falling freely conserved ? why ? 

5. 4. Why passengers are thrown forward from their seats when a speeding bus stops suddenly ?

6. 6. Why are the passengers thrown outwards when a car in which they are travelling suddenly takes a circular turn ?

7. 7. Show that if the net force acting on a particle is zero, its momentum will remain unchanged . 

8. 8. A cricket player lower his hands to catch the ball safely . Explain why ? 

9. It is easy to catch a table tennis ball than a cricket ball even both are moving with same velocity . why ?

10. Can a bomb initially at rest explodes into three pieces which fly in mutually perpendicular directions ?

11. While firing a bullet , the gun should be held tight to the shoulder .Why ? 

12. What is the principle of working of a rocket ? 

13. Carts with rubber tyres are easier to ply than those with iron wheels .why ? 

14. On what factors does the coefficient of friction depend ? 

15. A horse has to apply more force to start a cart than to keep it moving . Why ? 

16. Proper inflation of tyres of vehicles save fuel . Why ? 

17. What is the angle between frictional force and instantaneous velocity of the body moving over a rough surface ?

18. Does the angle of banking depend on the mass of vehicle ?

19. Why does a cyclist bend inwards while riding along a curved road ? 

20. A lift is going up with an acceleration 3g . A man is inside the lift and his mass is m . What will be the reaction of the floor on the man ?

SECTION – B NUMERICAL PROBLEMS

1. 1. A truck starts from rest and rolls down a hill with constant acceleration . It travels a distance of 400 m in 20 s . Calculate the acceleration of the truck and force acting on it , if its mass is 7 metric ton .

2. A car of mass 1000 kg is moving with a velocity of 10 m/s and is acted upon by a forward force of 1000 N due to engine and retarding force of 500 N due to friction . What will be the velocity after 10 seconds ?

3. A machine gun fires a bullet of mass 40 g with a speed of 1200 m/s . The person holding the gun can exert a maximum force of 144 N on it . What is the number of bullets that can be fired from the gun per second ?

4. A golf ball of mass 60 g at rest is hit with a striker . Find the impulse of the hit if the ball stops after travelling a horizontal distance of 50 m with a uniform retardation of 4 ms-2.

5. 2. A shell of mass 0.02 kg is fired by a gun of mass 10 kg . If the muzzle speed of the shell is 80 m/s , what is the recoil speed of the gun ?

6. Two billiard balls each of mass 50 g moving in opposite directions with a speed of 36 km/hr collide and rebound with the same velocity . What is the impulse imparted to each ball due to the other ?

7. A mass of 6 kg is suspended by a rope of 2m from a ceiling. A force of 50 N in the horizontal direction is applied at the midpoint of the rope . What is the angle the rope makes with the vertical in equilibrium ?

8. The initial speed of a body of mass 2 kg is 5 m/s . A force acts for 4 s in the direction of motion of the body . The force – time graph is as shown. Calculate the impulse of the force and the final speed of the body .

CBSE Class 11 Physics Laws of Motion Worksheet Set E 1

9. A ball moving with a momentum of 5 kg m /s strikes against a wall at an angle of 45 o and rebounds at the same angle . Calculate the change in momentum.

10. A bomb at rest explodes into three fragments of equal masses. Two fragments fly off at right angles to each other with velocities 9 m/s and 12 m/s respectively . Calculate the speed of the third fragment .

11. An elevator and its load weigh a total of 800 kg . Find the tension T in the supporting cable when the elevator ,originally moving downwards at 20m/s is brought to rest with constant retardation in a distance of 50 m. g = 10ms-2

12. Two bodies of masses 4 kg and 3 kg respectively are connected by a light string passing over a smooth frictionless pulley. Calculate the acceleration of the masses and tension in the string.

13. A body of mass 10 kg is sliding down a rough inclined plane which makes an angle of 30 0 with the horizontal . If the coefficient of friction is 0.25 ,find the acceleration of the body ? g = 10 m/s2

14. A circular race track of radius 400 m is banked at an angle of 10 o . If the coefficient of friction between the wheels of a race car and the road is 0.2 , what is the
 (i) optimum speed of the car to avoid wear and tear on its tyres
 (ii) maximum permissible speed to avoid slipping . g = 9.8 m/s2

15. A wooden block of mass 2 kg rests on a soft horizontal floor. When an iron cylinder of mass 25 kg is placed on top of the block , the floor yields steadily and the block and the cylinder together go down with an acceleration of 0.1 m/ s2 . What is the action of the block on the floor

(a) before
(b) after the floor yields ? g = 10 m/s2.

16. A train is moving along a horizontal track . A pendulum suspended from the roof makes an angle of 4 o with the vertical. Obtain the acceleration of the train . g = 10 m/s2

17. A body of mass 10 kg is placed on a smooth horizontal table . It is connected to a string which passes over a frictionless pulley and carries at the other end , a body of mass 5 kg . Calculate the acceleration of the masses and tension in the string.

18. A mass of 200 kg is resting on a rough inclined plane of 30 o . If the coefficient of friction is 1/√3, find the least and the greatest forces acting parallel to the plane to keep the mass in
equilibrium.

19. An aircraft executes a horizontal loop at a speed of 720 km/hr with its wings banked at 15 o . What is the radius of the loop ? g = 10 m/s2

20. A box of mass 4 kg rests upon an inclined plane . The inclination of the plane to the horizontal is gradually increased . It is found that when the slope of the plane is 1 in 3, the box starts sliding down the plane . Given g = 9.8 m/s2

(i)Find the coefficient of friction between the box and the plane .
(ii)What force applied to the box parallel to the plane will just make it move up the plane ?

21. A ball of mass 0.1 kg is suspended by a string 30 cm long . Keeping the string always taut, the ball describes a horizontal circle of radius 15 cm. Calculate the angular speed .

22. Determine the tensions T1 and T2 in the strings shown in figure.

CBSE Class 11 Physics Laws of Motion Worksheet Set E 2

23. The pulleys and strings shown in the figure are smooth and of negligible mass. For the system to remain in equilibrium, what should be the angle θ ?

CBSE Class 11 Physics Laws of Motion Worksheet Set E 3


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