B.1.4 Levers in Movement and Sport

Flashcards covering key concepts regarding the mechanics of levers as applied in human movement and sports.

Mechanical Advantage (MA)

The ratio of the effort arm to the load arm, indicating how effectively a lever multiplies effort force.

Class 1 Lever

A lever where the fulcrum is positioned between the effort and the load, allowing for a trade-off between force and speed.

Class 2 Lever

A lever where the load is positioned between the fulcrum and the effort, resulting in a mechanical advantage less than 1 and typically allowing for faster movement.

Class 3 Lever

A lever where the effort is applied between the fulcrum and the load, usually requiring more effort force but allowing for faster movement.

Effort Arm

The distance from the fulcrum to the point where effort is applied.

Load Arm

The distance from the fulcrum to the load being moved.

Fulcrum

The fixed pivot around which a lever rotates, such as an elbow or knee in the human body.

Effort

The applied force that moves the load, often generated by muscle contraction.

Lever

A rigid bar that rotates around a fulcrum to move a load using an applied effort.

Trade-off between force and speed

The balance between using less force for slower movement (with MA > 1) versus using more force for faster movement (with MA < 1).