Levers Flashcards
List the 5 components of a lever.
- Fulcrum.
- Force arm.
- Resistance arm.
- Input (effort) force.
- Output (resistance) force.
Define the fulcrum/axis.
The point around which the lever rotates.
Define the effort/force arm.
The distance between the fulcrum and the point at which the force is applied.
Define the resistance arm.
The distance between the fulcrum and the centre of the resistance.
Define the input (effort) force.
Force exerted on the lever.
Define the output (resistance) force.
Force exerted by the lever.
List the 3 types of levers.
- First class.
- Second class.
- Third class.
What determines the types of levers?
- Locations of the applied force
- Location of resistance
- Location of fulcrum
Draw a diagram illustrating a first-class lever.
Check the exercise book.
Draw a diagram illustrating a second-class lever.
Check the exercise book.
Draw a diagram illustrating a third-class lever.
Check the exercise book.
What are the three factors affecting levers?
- Length of the lever.
- The inertia of the lever.
- The amount of force.
Describe the length of the lever as a factor affecting levers.
Velocity is greater at the distal end of a lever. The longer the lever, the greater the velocity and momentum at impact provided an athlete can control the longer lever. A longer lever means more mass.
Who does not suit longer levers?
Children often have difficulty with this and use shorter levers to gain better control.
Describe the inertia of the lever as a factor affecting levers.
The longer the lever the heavier it is and therefore the more difficult to control. By gripping down on the implement in striking sports, athletes can reduce the rotational inertia of the implement therefore making it easier to swing.
