Class 9 - Physics

## Work, Power and Energy

*Worksheet*

**Fill in the blanks with suitable words.**

1. Energy is the __________ to do work. Its S.I. unit is ________.

2. Work is force multiplied by ___________ in the direction of force.

3. If the angle between force and the displacement caused is acute then work is said to be ________.

4. If the angle between force and the displacement caused is obtuse, the work is said to be _______.

5. One joule of work is said to be done when a force of ______ displaces a body through a distance of ________ in its own direction.

6. Mechanical energy is of two types i.e., (i) _________ energy (ii) ________ energy

7. Kinetic energy is the energy possessed by a body by virtue of its ________.

8. Potential energy is the energy possessed by a body by virtue of its ________ or __________.

9. According to law of conservation of energy, energy can neither be ________ nor can it be but it can be _____________ from one body to another.

10. According to the work-energy theorem, the work done by a force on a moving body is equal to

the increase in its ________ energy.

11. Gravitational Potential energy, P = ______

12. 1 kilowatt hour = J

13. Work has only _______, no _________. So work is a scalar.

14. The sum of the kinetic energy and the potential energy of an object is called its ________ energy.

15. _________ is defined as the rate of doing work or rate of transfer of energy.

**Answers**:

1: capacity, joule

2: displacement

3: positive

4: negative

5: 1 newton, 1 metre

6: Kinetic, Potential

7: motion/speed.

8: position, configuration

9: created, destroyed, transferred

10: kinetic

11: mgh

12: 3.6 × 10⁶J

13: magnitude, direction

14: mechanical

15: Power

**☛See also:**

Ch 11 - Work Power & Energy (MCQ)

Ch 11- Work Power & Energy (Q & A)

Ch 11- Work, Power & Energy (Worksheet)

Ch 11- Work and Energy (NCERT Solutions)

Ch 11 - Work, Power and Energy(Study Points)

Ch 11 - Work, Power Energy (Solved Numericals)

Ch 11 - Energy Transformations (Worksheet)

Ch11 - Work Energy & Power (Question Bank)

Ch 11 - Work Power & Energy (Eduvictors Quiz)

Ch 11- Work Power & Energy (Q & A)

Ch 11- Work, Power & Energy (Worksheet)

Ch 11- Work and Energy (NCERT Solutions)

Ch 11 - Work, Power and Energy(Study Points)

Ch 11 - Work, Power Energy (Solved Numericals)

Ch 11 - Energy Transformations (Worksheet)

Ch11 - Work Energy & Power (Question Bank)

Ch 11 - Work Power & Energy (Eduvictors Quiz)