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Work And Powers
Test Description: Review Questions!
Instructions: Answer all questions to get your test result.
1) In what unit or units is work measured?
A
J
B
kgXm/s2
C
m
D
N
2) Supposed Herbert is using a pulley to life a crate. Which of the following would cause Herbert to do more work?
A
lifting the crate less high
B
lifting the crate higher
C
lifting a lighter crate
D
lowering the crate instead of lifting it
3) When you are holding a heavy object stationary in your arms, you are not doing any work even though you may get tired. Why is this?
A
Friction is not acting on the object
B
You are not put a force on the object you are holding, despite feeling tired.
C
In order to do work, an object must be moved.
D
You are not getting tired quickly enough for it to count as work.
4) How much work would you have to do in order to life a 60 N object 2.5 meters?
A
14.3 J
B
50.5 J
C
175 J
D
150 J
5) Robert pulls a bucket of water 15 meters up from the bottom of a well. He pulled with a force of 58 newtons. How much work did Robert do?
A
680 J
B
870 J
C
570 J
D
764 J
6) In which of the following situations would the least work have been done?
A
A 250-N force moves an object 1 m.
B
A 25-N force moves an object 8 m.
C
A 100-N force lifts an object 3 m.
D
A 600-N force is applied to an object and moves it 0 m.
7) Which of the following is the best definition for power?
A
work per unit of time
B
work per unit of force
C
time per unit of force
D
force per joule
8) 1 J/s equals-
A
1 N
B
1 N m
C
1 kg m
D
1 W
9) Fernando does 550 Joules of work in 20 seconds. What was Fernando's power?
A
30.2 W
B
35.5 W
C
37.0 W
D
27.5 W
10) While building a fence, Simon did 1150 Joules of work in 50 seconds. What is Simon's power?
A
18 W
B
22 W
C
28 W
D
23 W
*select an answer for all questions
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