# Simple And Complex Machines: Question Preview (ID: 30330)

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What is the main reason people use machines?
a) There are many different kinds of machines.
b) Machines do work so people do not have to.
c) Machines make work easier and faster
d)

Which 2 things determine how much work it takes to do something?
a) weight and force
b) force and distance
c) distance and time
d)

What are simple machines?
a) Machines with only a few parts
b) machines with lots of parts
c) machines that make objects move quickly
d)

An ax and knife are examples of a
a) pulley
b) wedge
c) lever
d)

What kind of simple machine is a wheel chair ramp?
a) screw
b) inclined plane
c) wedge
d)

A _____________ is a device that uses energy to do work.
b) force
c) machine
d)

In order to move something, you have to use
a) friction
b) force
c) work
d)

How many simple machines are there?
a) 7
b) 10
c) 5
d)

When you move something up or down an inclined plane it takes
a) the same amount of energy
b) more energy
c) less energy
d)

A wedge is 2 inclined planes that meet.
a) true
b) false
c)
d)

The wider the wedge, the easier it is to move things apart.
a) true
b) false
c)
d)

A screw is a ___________ wrapped around a metal rod.
a) lever
b) inclined plane
c) wedge
d)

Screws hold things together.
a) true
b) false
c)
d)

The 2 parts to a lever are a board/bar and a
a) screw
b) fulcrum
c) wedge
d)

An example of a lever is a seesaw.
a) true
b) false
c)
d)

Wheels increase the amount of friction between things.
a) true
b) false
c)
d)

The wheel turns a greater distance with more force.
a) true
b) false
c)
d)

The axle turns a lesser distance with more force.
a) true
b) false
c)
d)

A gear is a _______________ with teeth.
a) screw
b) axle
c) wheel
d)

Gears transfer force from one place to another.
a) yes
b) no
c)
d)

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