Physics 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 X 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:
A
power
B
work
C
energy
10. Power is measured in:
A
Joules
B
Watts
C
Newtons
11. The rule for the calculation of power is:
A
Joules / seconds
B
energy X time
C
work / time
12. 1 Watt is equivalent to:
A
1 Joule per second
B
1/10 Newton per metre
C
1 Newton metre
13. The old imperial unit for power was the:
A
Kelvin
B
horsepower
C
kilojoule
14. If 100 Joules of work was done in 10 seconds, what power was used?
A
1 kiloWatt
B
10 Watts
C
1000 Watts
15. If a weightlifter lifts 2000 Newtons to a height of 2 metres in 4 seconds, how powerful is he?
A
1 horsepower
B
1 Watt
C
1 kiloWatt
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