Movement Analysis Flashcards
3 Parts of a Lever
- Fulcrum/Pivot
- Load
- Effort
First Class Lever
-Fulcrum in the middle
Example of First Class Lever
- Head and neck being flexed and extended, as in nodding when heading a football or in high jump.
Second Class Lever
Load in the middle.
Example of Second Class Lever
When you raise your toes when running or jumping.
Third Class Lever
Effort in the middle
Example of a Second Class Lever
A bicep curl during flexion.
Mechanical Advantage
The relative efficiency of each of the lever systems.
E.g. Rackets, oars, paddles, sticks and bats.
These pieces of equipment increase the length of the resistance arm of the lever. This in turn increases the speed at the end of the lever.
Mechanical Advantage Equation
Effort Arm / Resistance Arm
Resistance Arm
The part of the lever between the fulcrum and the resistance.
The longer the resistance arm, the greater the speed can be generated.
Effort Arm
The distance between the fulcrum and the effort.
Sporting implements are often used such as bats or rackets to increase the effort arm which will increase the force that an object such as a ball is struck.
However the optimal length of an implement should be determined by the strength of the person handling.
Mechanical Disadvantage
Most levers in the body are third class levers where the resistance arm is always greater than the effort arm (mechanical disadvantage).
The longer the resistance arm of the lever, the greater the speed at the end of it.
So when a bowler is bowling his arm must be fully extended to generate the most force and with the greatest speed.
3 Planes
- Frontal
- Transverse
- Sagittal
3 Axes
- Sagittal
- Longitudinal
- Transverse
Planes and Axes Acroymns
1) Spurs, Fans, Are, Always, Complaining
2) Lollipops, Taste, Really, Tasty
3) The, Swansea, Fans, Eat, Sheep
