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