1. Levers have the following:
Fulcrum – fixed pivot point
Effort arm – force is applied here
Resistance arm – exerts the force from the effort arm

2. The Lever I. Three Classes A. 1st Class
1. Defn: fulcrum is between the effort and the resistance

3. 2. Example
Scissors
resistance
fulcrum
effort

4. B. 2nd Class
1. Defn: resistance is between the effort and the fulcrum

5. 2. Example
Wheelbarrow
effort
resistance
fulcrum

6. C. 3rd Class
1. Defn: effort is between the resistance and the fulcrum

7. 2. Example
Hockey stick & arm
fulcrum
effort
resistance

8. M.A. = length of effort arm / length of resistance arm
Mechanical Advantage
M.A. = length of effort arm / length of resistance arm

9. Levers Mechanical Advantage
M.A. = Length of effort arm (Input arm) Length of resistance arm (Output arm)

12. Which one gives you a greater M.A.?
Levers
Which one gives you a greater M.A.? 12

13. Levers in the Body
Levers can be found throughout your body. In the last two panels of the diagram, where would the output force be? What is the class of lever for each part of the body? 13

14. Levers have the following:
Fulcrum – fixed pivot point
Effort arm – force is applied here
Resistance arm – exerts the force from the effort arm