1. Levers

2. Levers Levers are designed to allow either:
A greater resistance to be moved with a given force OR
To increase the velocity (speed) at which an object can be moved using a given force

3. Parts of a Lever Levers consist of 3 parts; Resistance Force Fulcrum
The distance from where a force is applied to the fulcrum is called the force arm (FA)
The distance from where a resistance acts to the fulcrum is called the resistance arm (RA)

4. First Class Lever
The fulcrum lies between the resistance and the force
Force Arm shorter than Resistance Arm favours speed and range of movement
Force Arm longer than Resistance Arm favours force output

5. First Class Levers

6. Second Class Lever
The resistance lies between the fulcrum and the force
The force arm and the resistance arm are on the same side of the lever
The Force Arm is always longer than the Resistance Arm

7. Second Class Levers

8. Third Class Lever
The force lies between the resistance and the fulcrum
The Force Arm is shorter than the Resistance Arm
In third class levers, the force applied is always greater than the resistance

9. Third Class Levers

10. Torque = Force x Distance
As all levers produce rotation about an axis, they also produce torque.
Torque is defined as a turning force
T = F x D
Torque = Force x Distance
The greater the force applied to a given force arm the greater the torque
The longer the force arm with a given force applied the greater the torque