Machines

SCIENCE YEAR 3

1. MACHINES

2. A machine is something we use to make work easier. Machines can be s imple or c omplex :

3. A simple machine has few or no moving parts.

4. A complex machine is made up of simple machines. C omplex machines have lots of different parts.

5. SIMPLE MACHINES T here are some examples of simple machines. A screw A wedge A wheel and axle A lever A pulley   An inclined plane          

6. AN INCLINED PLANE W e use inclined planes to move objects up and down in different levels. At the skate park you can enjoy them!

7. A screw W e use screws to hold things together or lift objects.

8. A wedge W e use wedges to cut objects.

9. A wheel and axle. W e use wheels and axles to move objects from one place to another.

10. A lever W e use levers to lift objects. I n a park you have fun playing with the seesaw!

11. A pulley We use a pulley to lift and lower heavy objects.

12. inclined plane inclined surface rope wheel load

13. lever fulcrum rigid bar wheel and axle wheel axle

14. tools We use a hammer to knock nails into a surface

15. We use screws to fix objects together . We use a screwdriver to turn screws .

16. We use nuts and bolts to hold objects together . We use a spanner to turn bolts .

17. We use a saw to cut wood or other materials .