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Chapter 12 - Work And Machines
Test Description: Work and Machines
Instructions: Answer all questions to get your test result.
1) A simple machine that might be thought of as an inclined plane that moves is a
A
wheel and axle
B
pulley
C
wedge
D
lever
2) One example of a compound machine is a
A
door
B
pliers
C
shovel
D
bicycle
3) The ideal mechanical advantage for an inclined plane is equal to the length of the inclined plane divided by the
A
mass of the incline
B
height of the inclined plane
C
slope of the incline
D
angle of the incline
4) Which is the best scientific definition of a machine?
A
a machine changes the amount of input force
B
a machine can either be simple or compound
C
a machine is a time saving device that uses motors and gears
D
a machine makes work easier by changing force, distance, or direction
5) Power is measured in units called
A
newtons
B
joules
C
watts
D
meters
6) The wedge, screw, and lever are all
A
found in the human body
B
simple machines
C
compound machines
D
100% efficient
7) A device that is twice as powerful as another can do ___________ the amount of work in the same time.
A
four times
B
triple
C
twice
D
half
8) The force exerted by a machine is called the __________ force.
A
output
B
input
C
power
D
work
9) You do ___________ on an object when you lift it of the floor and onto a shelf.
A
nothing
B
work
C
newtons
D
power
10) A machine can never be 100% efficient because some work is lost due to
A
mass
B
physics
C
friction
D
gravity
*select an answer for all questions
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