اختبار الكتروني درس Energy:Resources and Forms

1
Who does work from the following cases?
2
A force of 10 newtons affects a body of mass 3 kg.to move it 5 m ,so the work done is .....joules
3
Food and fuel are sources of.......energy
4
-..........is a permanent source of energy
5
Chemical energy is stored in the......
6
Weight of the body on the Earth equals its.........
7
Potential energy equals.....
8
An object of a mass2 kg .is moving at a speed of 4 m/s,so it has a kinetic energy equals .........joules
9
An object of 20 N weight and it is placed at a height of 5 m ,so its potential energy is........joules
10
Kinetic energy=.....