Simple machines

We use simple machines

• to work harder
• to make work easier
• to have fun
• to do homework

How do simple machines make work easier?

• with electricity
• with an elephant
• making work more difficult
• reducing the effort needed to do work

A lever

• makes it difficult to move an object
• can't move an object
• makes it easier to move an object
• is not a simple machine

the three main parts of a lever are

• the pivot point, the load and the effort
• electricity, water and air
• paper, pencil and glue
• wheel, axle and pulley

What is NOT an example of a lever

• bottle opener
• scissors
• pulley
• wheelbarrow

We use a pulley to

• make it easier to lift or lower heavy objects
• open bottles
• transport
• fly

What sentence is correct?

• A pulley is a complex machine
• A pulley has a wheel, an axle and a rope
• You con use a pulley to take the top off a bottle
• with more pulleys it's harder to move an object

An inclined plane is

• a pulley
• a lever
• a ramp used to lift and lower objects
• We can use a complex machine to move heavy objects

A lever has to forces

• load and fulcrum
• load and pivot point
• load and effort
• load and force

Three examples of simple machines are

• levers, pulleys and inclined planes
• pulleys, levers and computers
• inclined planes, cars and pulleys
• inclined planes, pulleys and televisions