Monday 31 December 2018

CBSE Class 9 - Physics - Work, Power and Energy - Worksheet (#eduvictors)(#cbsenotes)

Class 9 - Physics 

Work, Power and Energy 

Worksheet

CBSE Class 9 - Physics - Work, Power and Energy - Worksheet (#eduvictors)(#cbsenotes)


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


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