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Chapter 13
Test Description: Work
Instructions: Answer all questions to get your test result.
1) Machines decrease the amount of energy that is needed to do the work
A
false
B
true
2) Because of friction, using machines increases the amount of energy that is needed to do work
A
false
B
true
3) an arrangement of multiple pulleys causes the direction of the output force to be opposite to the direction of the input force
A
true
B
false
4) a first class lever always has an input force that is less than the output force
A
true
B
false
5) a second class lever always has an input force that is less than the output force
A
true
B
false
6) increasing the angle of a tramp makes with the horizontal decreases the mechanical advantage
A
false
B
true
7) A meteorologist trying to predict global warming would consider Earth to be a closed system
A
false
B
true
8) a ball falling under the force of gravity is a closed system
A
true
B
false
9) increasing the length of a ramp increases the efficiency of the ramp
A
false
B
true
10) How many weeks in quarter at Bishop
A
9
B
11
C
12
D
10
*select an answer for all questions
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