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Internal / External Forces

Internal Forces (muscle strength) Skilled movement depend on the summation, continuity and direction of forces
Summation of forces Achieved by combining the forces generated by several different joints and muscle groups (tug of war)
Continuity of forces Movement should begin with the larger muscle groups and progressively move towards the smaller muscles.
Direction of forces For every action there is an equal and opposite reaction.
Errors of direction of force Strength imbalance. Incorrect body position. Poor technique.
External Forces Gravity. Depending on the position of the limb or body, the same movement can work different muscle groups.
Inertia Resistance to a change in motion. Force is required to slow down, stop and change direction of movement. More momentum more force is required.
Levers Rigid body that rotates about an axis or fulcrum. Muscluar force is applied where muscle inserts in the bone and not in the belly of the muscle, or at the joint itself,
Created by: LisaSceviour