**Work and Energy**

**Worksheet- Fill in the blanks***. A force acting on a body shows a displacement in the direction normal to the direction of the force. It is said _______ done on the body.*

**1***. A force acting on a body shows a displacement in the direction of the force. It is said _______ is done on the body.*

**2***. Work done is defined as the product of _____ and ______ in the direction of force.*

**3***. SI Unit of work is _______.*

**4***. 1 Joule = ____ × ____.*

**5***. Work done on an object is _____ if displacement is zero.*

**6***. Work is a ______ (scalar/vector) quantity.*

**7***. Work done is positive when the angle between force and displacement is ____ (acute/obtuse)*

**8***. Work done is negative when the angle between force and displacement is ____ (acute/obtuse)*

**9***. An object moving in a circular orbit. The work done by the centrepetal force acting on the object is ______ (zero/non-zero).*

**10***. Work done against a force is stored as _____.*

**11***. Ability to do work is called _______.*

**12***. Ability of a body to do work due to its position or configuration is known as _________ of the body.*

**13***. A form of energy an object has because of its motion is called ________.*

**14***. A stretched rubber band acquires _________(potential/kinetic) energy.*

**15***. Work done against gravity in lifting a mass is stored as ______. Numerically, it is*

**16**equal to m ×_ ×__.

*. Work done by gravity on a falling body is available as ______ (kinetic/potential) energy on reaching the ground.*

**17***. Kinetic Energy = ½ × _ × _*

**18***. If the mass is doubled while its speed remains the same, the kinetic energy will be _____ (be same/double/four times) of the initial kinetic energy.*

**19***. The sum of P.E. and K.E. is called __________.*

**20****Answer**:

1. work is not

2. work

3. force and displacement

4. Joules

5. 1 Newton × 1metre

6. zero

7. scalar

8. acute

9. obtuse

10. zero.

11. energy

12. energy

13. potential energy

14. kinetic energy

15. potential energy

16. potential energy, m×g×h

17. kinetic

18. ½ m v

^{2}

19. double

20. mechanical energy

.

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