Quiz:
Work and Power

1. If a force moves an object or changes its direction, what is being done?
A power
B energy in joules
C work
2. The unit used to measure Work is:
A horsepower
B newtons
C joules
3. The rule for calculating Work is:
A force × distance
B mass / volume
C energy / time
4. Who does more work - a man who lifts a large box from the ground up into the back of a truck, or a man who puts the same box on a trolley and wheels it up a ramp into the truck?
A the man who lifts it
B the man with the trolley
C they do the same work
5. A weightlifter lifts barbells of 200 newtons above his head to a height of 2 metres. How much work does he do?
A 400 newtons
B 100 joules
C 400 joules
6. Energy and work use the same unit of the Joule because:
A that is the unit chosen by the scientist named Pascal who studied heat
B energy is required to do work
C both measure the speed at which power is used
7. One kilojoule equals:
A 1000 joules
B 100 joules
C 1⁄1000 joule
8. The old imperial unit for energy was the:
A basal energy requirement
B calorie
C kilojoule
9. The rate at which work is done is called:
Apower
Bwork
Cenergy
10. Power is measured in:
Ajoules
Bwatts
Cnewtons
11. The rule for the calculation of power is:
Ajoules / seconds
Benergy × time
Cwork / time
12. 1 watt is equivalent to:
A1 joule per second
B1⁄10 newton per metre
C1 newton metre
13. The old imperial unit for power was the:
Akelvin
Bhorsepower
Ckilojoule
14. If 100 joules of work was done in 10 seconds, what power was used?
A1 kilowatt
B10 watts
C1000 watts
15. If a weightlifter lifts 2000 newtons to a height of 2 metres in 4 seconds, how powerful is he?
A1 horsepower
B1 watt
C1 kilowatt
 
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