What is the main reason people use machines?

Which 2 things determine how much work it takes to do something?

What are simple machines?

An ax and knife are examples of a

What kind of simple machine is a wheel chair ramp?

A _____________ is a device that uses energy to do work.

In order to move something, you have to use

How many simple machines are there?

When you move something up or down an inclined plane it takes

A wedge is 2 inclined planes that meet.

The wider the wedge, the easier it is to move things apart.

A screw is a ___________ wrapped around a metal rod.

Screws hold things together.

The 2 parts to a lever are a board/bar and a

An example of a lever is a seesaw.

Wheels increase the amount of friction between things.

The wheel turns a greater distance with more force.

The axle turns a lesser distance with more force.

A gear is a _______________ with teeth.

Gears transfer force from one place to another.

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