Unit 7 machines

1. UNIT 7. MACHINES AND INVENTIONS 1. MACHINES AND ENERGY

2. A machine is an instrument that makes work easier

3. There are two types of machines: Simple machines Complex machines

4. SIMPLE MACHINES • Simple machines are called tools and they don’t have many parts. They often have one or two parts

5. PLIERS are simple machines

6. A SCREWDRIVER is a simple machine

7. A BOTTLE OPENER is a simple machine

8. A PENCIL SHARPENER is a simple machine

9. A HAMMER is a simple machine

10. complex MACHINES Complex machines have many parts. They have more than two parts.

11. A WASHING MACHINE is a complex machine

12. An ELECTRIC SCREWDRIVER is a complex machine.

13. A WATCH is a complex machine

14. A BICYCLE is a complex machine

15. ALL MACHINES NEED ENERGY TO WORK.

16. Most machines that help us move burn fuels A car A planeA bus need fuel

17. Other machines use electricity A hairdryer An electric drill need electricity

18. Some machines use human energy A stapler scissors need energy from people

19. Some machines use energy from the… sun wind water They produce very little pollution.

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