1. Teacher: SARA PASCUAL U. 6MACHINES

2. MACHINES are inventions that help us carry out activities with less effort.

3. TYPES OF MACHINES  Simple machines  Complex machines

4. SIMPLE MACHINES They are made from only a few components hammerbroom wheel

5. SIMPLE MACHINES They are made from only a few components screwtongs See-saw

6. COMPLEX MACHINES They are made up of many more components Vacuum cleanercomputertelevision

7. COMPLEX MACHINES They are made up of many more components traintabletcrane

8. POWER SOURCES Machines get their power from different sources. Some machines work on manual power. For example: a bike, a spade… Some machines run on electricity. For example: traffic lights, mobiles phones… Others get their power by burning fuel. For example: cars

9. SIMPLE MACHINES AND THEIR USES

10. A wheel is a circular object that rotates around a central axle.

11. A ramp is used to raise and lower objects more easily.

12. A lever is made up of a long bar that moves up and down over a pivot.

13. A pulley is made up of a wheel and rope.

14. COMPLEX MACHINES AND THEIR USES The majority of machines we use in our lives are complex. Most of the time, complex machines are formed by using different types of simple machines.

15. Brakes are a set of levers. The handlebar is a lever. The wheels turn on an axle. Pedals are levers that use human force to move a cyclic gear.

16. USING MACHINES We need to be careful when we use machines. To avoid hurting ourselves, we must always read the safety instructions. Many machines that need fuel to work, produce pollution. We must reduce the use of those machines.

17. QUESTIONS

18. COMPLETE THE TEXT WITH THE WORDS BELOW. electricity person engines energy fuel Machines need ………….. to work. Manual machines use the force of a ……………, while electric machines use …………….. Some machines have ……………… that burn ………………

19. Which is the type of power that comes from a person?

20. Which type of energy do they need?

21. CLASSIFY THE FOLLOWING MACHINES INTO SIMPLE OR COMPLEX. Bike Roller skate Well Vacuum cleaner Tablet SIMPLECOMPLEX

22. WHICH SIMPLE MACHINE DOES THIS PICTURE SHOW? IDENTIFY THE DIFFERENT PARTS. PIVOT LOAD EFFORT