Speaking exercises

2. Machines are objects we use to
make work easier.

3. All machines use energy:
•from people (screwdriver, wheelbarrow…)
•electrical (microwave, washing machine…)
•from water (watermills…)
•from wind (windmills…)

4. Uses:
• to apply force.
•to transport things.
•to heat or cool things.
•to communicate.
•to process information.

5. SIMPLE MACHINES
•They have one part or just a few parts.
•They use energy from people to work.
The pulley The leverThe inclined
plane

6. The pulley:
•We use it to lift and lower heavy objects.
•It has got an axle.

7. The inclined plane:
•It is a ramp.
•We use it to move heavy things up or
down.

8. The lever:
•It is a rigid bar.
•It has got a pivot point.
•We use it to lift heavy objects.

11. COMPLEX MACHINES
They are made up of many operating parts.

12. A bike is a complex machine.
It has got two pedals, a handle bar, two
wheels, teeth, gear and a chain.

14. Look at these machines.
•What are their names?
•Are they simple or complex
machines?
•We use them to…
• to apply force.
•to transport things.
•to heat or cool things.
•to communicate.
•to process information.