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
12. A bike is a complex machine.
It has got two pedals, a handle bar, two
wheels, teeth, gear and a chain.
13.
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.