Introduction to Physical Science

Chapter 14: Work and Simple Machines

Section 2 Self-Check Quiz-Eng.

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)1 000
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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