Work And Machines: Question Preview (ID: 8298)

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Which one of the following is NOT a simple machine?
a) lever
b) pulley
c) hammer
d) inclined plane

Which description does the phrase
a) The same amount of work using less force.
b) The same amount of power using less work.
c) The same amount of work using less power.
d) The same amount of power using less pulleys.

Why are all machines NOT 100% efficient?
a) mass
b) gravity
c) friction
d) distance

What makes simple machines useful for people without enough strength to complete a task?
a) Work is reduced, while time is decreased
b) Input force is reduced, while time is increased.
c) Power is increased, while distance is decreased.
d) Input force is reduced, while distance is increased

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

Wedges are used to ____________ things.
a) Separate
b) accelerate
c) slow down
d) change the direction of

Which of these items is NOT a wedge?
a) axe
b) knife
c) ramp
d) ice pick

What form of simple machine is a hammer?
a) lever
b) screw
c) pulley
d) inclined plane

A screw is most closely related to a _____________.
a) pulley
b) wedge
c) wheel and axle
d) inclined plane (ramp)

When using a lever, what is the input force called?
a) work
b) effort
c) fulcrum
d) resistance

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