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PE - BIOMECHANICS

Chapter 5

TermDefinition
Equilibrium When an object has no unbalanced forces or torques acting on it
Static Equilibrium All vertical and horizontal forces and torques equal zero.
Dynamic Equilibrium Moving with a constant velocity
stability The resistance to the disruption of equilibrium
Factors affecting stability Base of support, centre of gravity, line of gravity, body mass, friction between body and surfaces contacted
Base of support The area bound by the outside edges of the body parts in contact with the surface
Relationship between base of support and stability As base of support increases, the stability increases
Centre of gravity The point around which weight is balanced
Relationship between CoG and stability The higher the CoG, the less stable a body will be and the lower the CoG the more balanced and stable will be
Line of gravity The direction in which gravity acts through a body. When the line of gravity acts through the base of support, stability is increased
Body mass F = MA, Greater the mass the greater the force required to move it. Increased mass = increased stability
Friction Increased friction = increased stability eg: wax on surfboards and studs on boots
Created by: charlee keating
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