Chapter 13 Question Preview (ID: 5982)
Work.
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Machines decrease the amount of energy that is needed to do the work
a) true
b) false
c)
d)
Because of friction, using machines increases the amount of energy that is needed to do work
a) true
b) false
c)
d)
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
c)
d)
a first class lever always has an input force that is less than the output force
a) true
b) false
c)
d)
a second class lever always has an input force that is less than the output force
a) true
b) false
c)
d)
increasing the angle of a tramp makes with the horizontal decreases the mechanical advantage
a) true
b) false
c)
d)
A meteorologist trying to predict global warming would consider Earth to be a closed system
a) true
b) false
c)
d)
a ball falling under the force of gravity is a closed system
a) true
b) false
c)
d)
increasing the length of a ramp increases the efficiency of the ramp
a) true
b) false
c)
d)
How many weeks in quarter at Bishop
a) 9
b) 10
c) 11
d) 12
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