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