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Work And Power
Test Description: Review questions!
Instructions: Answer all questions to get your test result.
1) How much work is done when a very large force is applied to an object but does not move the object?
A
a lot
B
a little
C
The exact amount of work and the weight of the object to figure this out.
D
none
2) Which of these is the unit of measure for work?
A
pounds
B
joules
C
watts
D
newtons
3) What is the correct formula for work?
A
Work= force * distance
B
Work= force/distance
C
Work=mass * acceleration
D
Work= force/time
4) Which of the following in NOT an example of work?
A
an air bag deploying in an automobile wreck
B
a windmill turning in the wind
C
a person sliding a box across the floor
D
a metal bar bracing a learning brick wall
5) What is the work done on a 34-N weight if it is lifted up 1 km?
A
34,000 J
B
34 J
C
0.034 J
D
17 J
6) A sailboat weighing 1,960 N moves at 3m/s for 10 minutes. What is the value for the work of the sails?
A
58,800 J
B
1,176,000 J
C
19,600 J
D
3,528,000 J
7) What are the units for power, work, and force?
A
Power is measured in watts, work is measured in newtons, and force is measured in joules.
B
Power is measured in newtons, work is measured in watts, and force is measured in joules.
C
Power is measured in joules, work is measured in newtons, and force is measured in m/sec2.
D
Power is measured in watts, work is measured in joules, and force is measured in newtons.
8) What units define a watt?
A
joules/meter
B
joules/second
C
newtons/seconds2
D
newtons/meter
9) What is the correct formula for power?
A
Power= work/time
B
Power=work*distance
C
Power=force*distance
D
Power=work*time
10) Power is measured in watts, work is measured in joules, and force is measured in
A
Newtons
B
M/s
C
Watts
D
None of the above
*select an answer for all questions
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