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Chapter 6 Work Energy and Power 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 6 Work Energy and Power Worksheet Pdf
WORK , ENERGY AND POWER
SECTION – A CONCEPTUAL AND APPLICATION TYPE QUESTIONS
1. A body is moving at constant speed over a frictionless horizontal surface . What is the work done by gravitational force ?
2. 1. Does the work done in raising a suitcase on to a platform depend upon how fast it is raised up ?
3. 2. Is it possible that a body be in accelerated motion under a force acting on the body , yet no work is being done by the force ? Explain with an example.
4. 3. A light body and a heavy body have same kinetic energy . Which one has greater linear momentum ?
5. 4. How does KE of a body change if its momentum is doubled ?
6. 5. Is work done by a non conservative force always negative ?Comment .
7. 6. Can a body have momentum without energy ?
8. Two masses one n times heavier than the other are dropped from same height . How dotheir momentum compare just before they hit the ground ?
9. A spring is cut into two halves .How is the spring constant of each half affected ?
10. Two springs A and B are identical but A is harder than B . On which spring more work will be done if they are stretchedby same force ?
11. A lorry and a car with the same kinetic energy are brought to rest by the application of the brakes which provide equal retarding force . Which of them will come to rest in a shorter distance ?
12. What happens to the potential energy :
a) Two dissimilar charges are brought near each other
b) A body is taken away against the gravitational force .
13. Two coolies lift same load from the road to the roof of a bus . One of them takes 1 minute and the other takes 2 minutes to do the same job .who has done more work and whose power is more ?
14. Name the process in which
(i) Momentum is conserved but KE is not conserved ?
(ii) Momentum changes but KE does not change ?
15. Difference between conservative and non – conservative forces.
16. Show that power is equal to dot product of force and velocity .
17. What are head – on and oblique collisions ?
18. Is total energy conserved in an inelastic collision ?
19. Why does a pilot looping a vertical loop not fall down even at the highest point ?
SECTION – B NUMERICAL PROBLEMS
1. In a ballistics demonstration a police officer fires a bullet of mass 50 g with speed 200 m/s on a soft plywood of thickness 2 cm . The bullet emerges with only 10 % of its KE . What is the emergent speed of the bullet ?
2. A bullet of mass 50 g moving with velocity of 400 m/s strikes a wall and goes out from the other side with a velocity of 100 m/s . Calculate the work done in passing through the wall ?
3. The momentum of a body is increased by 100 % .What is the percentage increase in its KE ?
4. A train of mass 2000 quintal is drawn up an inclined plane of 2 in 100 at the rate of 72 km/h.If the resistance due to friction is 3000 N , calculate the power of the engine .
5. 2. A ball is dropped from rest at a height of 12 m . If it loses 25 % of KE on striking the ground ,what is the height to which it bounces ?
6. 3. A mass of 2 kg attached to a spring is vibrated horizontally by displacing the mass 40 cm from its equilibrium position and releasing it . Find the maximum velocity of the mass .Spring constant is 24.5 N/m
7. 4. A pump on the ground floor of a building can pump up water to fill a tank of volume 30m3in 15 min . If the tank is 40 m above the ground , the efficiency of the pump is 30 % ,how much electric power is consumed by the pump ?
8. 5. A bullet of mass 0.012 kg and horizontal speed 70 m/s strikes a block of wood of mass 0.41 kg and instantly comes to rest with respect to the block. The block is suspended from the ceiling by means of thin wires . Calculate the height to which the block rises . Also estimate the amount of heat produced in the block.
9. A metal ball of mass 2 kg moving with speed of 36 km/h has a head on collision with a stationary ball of mass 3 kg . If after collision both the balls move as a single mass , what will be the loss in kinetic energy due to collision ?
10. If the kinetic energy of a body increases by 300 % , by what percent will the linear momentum of the body increase ?
11. A mass of 4 kg moving with 10 m/s comes to rest , after covering 2m on a horizontal surface . Calculate
(i)coefficient of kinetic friction between surfaces
(ii) workdone by frictional force
(iii)workdone by gravitational force.
12. A body of mass 2 kg is resting on a rough horizontal surface . A force of 20 N is now applied to it for 10 seconds , parallel to the surface . If the coefficient of kinetic friction between the surfaces in contact is 0.2 s , calculate
(i)workdone by the applied force in 10s
(ii)change in kinetic energy of the object in 10 s
13. A girl of mass 50 kg sits in a swing formed by a rope of 8m length. A person pulls the swing to a side so that the rope makes an angle of 60 0 with the vertical .What is the gain in potential energy of the girl ?
14. A car of mass 1000 kg accelerates uniformly from rest to a velocity of 54 km/hr in 5 seconds. Calculate
(i)its acceleration
(ii)its gain in KE
(iii)average power of the engine during this period , neglect friction.
15. A molecule in a gas container hits a horizontal wall with speed 200 m/s and angle 30 o with the normal , and rebounds with the same speed .
(i)Is momentum conserved in the collision?
(ii)Is the collision elastic or inelastic ?
16. Two identical ball bearings in contact with each other and resting on a frictionless table are hit head – on by another ball bearing of the same mass moving initially with a speed v . If the collision is elastic , which of the situations shown ,is a possible result after collision ?
17. The bob of a pendulum isreleased from a horizontal position A as shown . If the length of the pendulum is 1.5 m , what is the speed with which the bob arrives at the lowermost point B , given that it dissipates 5 % of its initial energy against air resistance ?
18. A 1 kg block situated on a rough incline to a spring of spring constant 100 N/m as shown . The block is released from rest with the spring in the unstretched position The block moves 10 cm down the incline before coming to rest . Find the coefficient of friction between the block and the incline .Assume that the spring has negligible mass and the pulley is frictionless .
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CBSE Class 11 Physics Chapter 6 Work Energy and Power Worksheet
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Worksheet for Physics CBSE Class 11 Chapter 6 Work Energy and Power
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