# Work , energy and Power Important questions | Grade VIII

## Important questions for Work Energy and Power | Grade VIII

1. Define work with its unit and formula .
2. Define 1 joule work .
3. What are the two conditions for work done ?
4. Write the types of work .
5. Define work against gravity .
6. Define work against friction .
7. A man is standing with a load on his head is not work in science , why ?
8. Define energy .
9. Define 1 joule of energy .
10. Write the form of energy .
11. Define light , heat , sound , electrical , magnetic chemical , nuclear and mechanical energy .
12. Define kinetic and mechanical energy with examples .
13. What are the two factor in which K.E. depends ?
14. What are the factor in which P.E. depends ?
15. When a body lifted from ground gains energy , How ?
16. Energy and work done has same unit , why ?
17. Write the principle of conservation of energy .
18. Define transformation of energy .
19. Write the differences between force and work , work and power .
20. Define power .
21. Define 1 watt power .
22. 60 watt is written in electric bulb . What does it mean ?
23. The electric motor has power of 150 watt . What does it mean ?
24. Write the relationship between Horsepower and watt .
25. Write the relationship between Horsepower and megawatt .