1. Levers&Pulleys

2. Parts of a Lever Fulcrum Effort Load Load Arm
A lever is a simple machine used to reduce the amount of effort it would take to lift a load or reduce the amount of effort needed to do work. There are 3 types of levers: Class 1, Class 2, and Class 3. The effort needed to lift a load is measured in Newtons.

3. Classes of Levers

4. Class 1 Levers F
A Class 1 Lever has its fulcrum between the effort and the load.

5. Class 2 Levers L
A Class 2 Lever has its load between the effort and the fulcrum.

6. Class 3 Levers E
A Class 3 Lever has the effort between the load and the fulcrum.

7. Levers Quiz Use the following slides to quiz yourself on how how well you can match commonly used items with their correct class of lever.

8. Click on the correct Lever classification for the tool pictured below.
Class Class Class3

9. Click on the correct Lever classification for the tool pictured below.
Class Class Class3

10. Click on the correct Lever classification for the tool pictured below.
Class Class Class 3

11. Click on the correct Lever classification for the tool pictured below.
Class Class Class 3

12. Click on the correct Lever classification for the tool pictured below.
Class Class Class 3

13. Click on the correct Lever classification for the tool pictured below.
Class Class Class 3

14. Click on the correct Lever classification for the tool pictured below.
Class Class Class 3

15. Click on the correct Lever classification for the tool pictured below.
Class Class Class 3

16. Click on the correct Lever classification for the tool pictured below.
Class Class Class 3

17. Levers and
Advantage

18. Levers can provide Mechanical Advantage by reducing the effort needed to lift a load. The closer the fulcrum is to the load, the less effort is needed to lift the load. The load does not move a great distance. L E F

19. Levers can be used to move loads farther if the fulcrum is placed close to the effort. In this situation more effort is needed to lift the load, but the load will move farther than if the fulcrum was closer to the load. L E F