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