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WorksheetsLesson 4
Total questions: 15
Worksheet time: 3mins
1. Who does work from the following cases ?
a. A person pushes a wall
b. A person plays football
c. A person sleeps
d. A person studies, while he is sitting
2- A force of 10 newtons affects a body of mass 3 kg. to move it 5 m., so the work done is ············ joules.
5
30
50
150
3- Food and fuel are sources of ……………. energy
a. chemical
b. mechanical
c. electric
d. sound
4- ··········· is a permanent source of energy.
petrol
The sun
coal
Nuclear reaction
5- ············ is an example of the source of electric energy.
Oven
Solar cell
Electric fan
Oil lamp
6- ············ is from the clean sources of energy.
a. Petrol
b. Coal
c. Wood
d. Wind
7. Chemical energy is stored in the……….
a. car battery
b. stretched spring.
c. raising of a load upwards.
d. car lamps
8- Weight of the body on the Earth equals its ············
a. mass+ gravity acceleration
b. mass x gravity acceleration
c. mass+ gravity acceleration
d. mass - gravity acceleration
9- Potential energy equals ············
a. weight x height
b. mass X height
c. weight x speed
d. no correct answer
10. An object of 20 N weight and it is placed at a height of 5 m, so its potential energy is………. joules.
50
100
150
200
11- The mechanical energy is the sum of ………. energies.
a. light and kinetic
b. heat and potential
c. potential and light
d. kinetic and potential
12- Speed is the ability to do work or to make a change
True
False
13- The kinetic energy of a static object equals zero
True
False
14 - Kinetic energy= Mass x (Speed)2.
True
False
15- Potential energy of an object decreases by increasing its height
True
False
