Work energy and power class 11 question bank set-01

 1. Derive the mathematical relationship between momentum and kinitic energy.

2. What is the dimension of kinitic energy?

3. A body of mass 0.3 kg is taken up an inclined plane to length 10 m height 5 m and then allowed to slide down to the bottom again . The coefficient of friction between the body and the plane is 0.15. What is the

 a) work done by the gravitational force over the round trip ,

b) what done by the applied force over the upward journey,

c)  what done by the frictional force over the round trip ,

d) kinetic energy of the body at the end of the trip?

4. A body of mass M is moved along a straight line by a machine delivery a constant power P. Find the expression for the distance moved by the body in terms of M ,P and t.

5. Is it necessary that work done in the motion of a body over a closed loop is zero for every force in nature ? Explain.

6. Springs A and B are identical except that A is stiffer than B. In which spring has done more work if they are stressed by same force ?

7. What are conservative forces?

8. Show that the work done in moving a body against the gravity is independent of the path taken. Or , show that gravitational force is a conservative force.

9. A ball bounced to 80% of its original height.  What fraction of its mechanical energy is lost in each bounce ? where does this energy go?

10. Write the properties of conservative forces.

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