Tennessee Science Grade 7

Section 2: Using Machines

Self-Check Quiz - English

1
How do input force and output force relate to each other?
A)They are always different.
B)They are the same.
C)They are unrelated.
D)The input is always less than the output.
2
What happens to the total amount of work done when you use a machine compared to not using a machine?
A)It increases.
B)It decreases.
C)It stays the same.
D)It goes to zero.
3
Mechanical advantage is equal to __________.
A)output force divided by input force
B)input force divided by output force
C)input force times output force
D)output force times input force
4
What is the mechanical advantage if 50 J are put in and 200 J are produced?
A)1000
B)4
C)50
D)200
5
The efficiency of all machines is __________.
A)more than 100 percent
B)impossible to calculate
C)less than 100 percent
D)exactly 100 percent
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