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Work And Machines
Test Description: Review
Instructions: Answer all questions to get your test result.
1) Which one of the following is NOT a simple machine?
A
inclined plane
B
pulley
C
hammer
D
lever
2) Which description does the phrase
A
The same amount of power using less work.
B
The same amount of work using less force.
C
The same amount of power using less pulleys.
D
The same amount of work using less power.
3) Why are all machines NOT 100% efficient?
A
friction
B
gravity
C
mass
D
distance
4) What makes simple machines useful for people without enough strength to complete a task?
A
Power is increased, while distance is decreased.
B
Work is reduced, while time is decreased
C
Input force is reduced, while distance is increased
D
Input force is reduced, while time is increased.
5) How can the mechanical advantage of an inclined plane be expressed as a ratio?
A
length/height
B
length/time
C
length * height
D
mass/length ^2
6) Wedges are used to ____________ things.
A
change the direction of
B
accelerate
C
Separate
D
slow down
7) Which of these items is NOT a wedge?
A
ice pick
B
ramp
C
knife
D
axe
8) What form of simple machine is a hammer?
A
inclined plane
B
pulley
C
lever
D
screw
9) A screw is most closely related to a _____________.
A
pulley
B
wedge
C
inclined plane (ramp)
D
wheel and axle
10) When using a lever, what is the input force called?
A
effort
B
fulcrum
C
work
D
resistance
*select an answer for all questions
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