UNIT 5: FORCES AND MACHINES

A force is a push or a pull on an object.

The effects can be:

- Start moving.

- Stop moving.

- Change shape.

- Break.

There are two types of forces:

-Contact forces.

-Non-contact forces.

Machines are devices that do a task. The make our lives easier and they requiere energy to work. There are different forms of energy:

- Mechanical energy.

-Electrical energy.

-Chemical energy.

-Light energy.

Simple machines have only One or a few parts:

Some inventions and discoveries that changed history are:

Machines, science and technology have changed the way we live in many ways:

Activity

Games to practice:

Natural Science 4th course