The opposite of simple is....

An example of a complex machine is...

What is this simple machine?

This is a .....

In a watermill, the big outside wheel turns an ________ on the inside which turns a millstone.

To invent is to....

7,000 years ago...

The wheel was first used for....

A bar that connects two wheels is called...

Stairs are a

A _______ is a rope or chain wrapped around a wheel.

Solar power uses energy from the .....

How many continents are there?

These countries are in which continent?

Spain, France, Sweden, Italy

Which is your favorite invention?

At festivals people like to throw.....

The first computer was called the __________

The smallest engine is in the smallest car called______

Who invented the airplane?

One of the first uses of the wheel was used on one of these. What is it called?

We use these for small machines.

This is a type of fuel that makes a lot of pollution.

Some of the first machines was made with this.

This is something found in complex machines.

Another name for a ramp is an __________

We use this on a pulley to lift heavy objects.

Dark colors _______ a lot of light so you shouldn't wear them in summer.

Sounds make ________.

Past tense of ride is ____

Past tense of buy:

Past tense of choose:

Past tense of catch:

These help flying machines be controlled.

What is the past tense verison of this sentence?: The boy eats breakfast.