Biomechanics Flashcards
Momentum
Mass x velocity
Amount of motion an object posesses
How can momentum be increased?
- Increase speed
- Increase mass
Law of conservation momentum
Momentum is conserved in any interaction with a closed system (a system that does not lose or gain mass, or isn’t affected by external factors)
Impulse
Force x time
A change in momentum, result of a force acting on an object over a period of time
Methods to increase impulse
Apply a greater force
Apply the force over a greater period of time
Elasticity
The degree of compression then expansion of an object to its original shape
Coefficient of Restitution
The bounciness of an object, measures the elasticity of a collision, and the remaining energy after a collision.
- when a COR = 1 it is a perfectly elastic collision
- when a COR = 0 it is a perfectly inelastic collision
Factors that influence the coefficient of restitution
Temperature
Velocity
Equipment
Surfaces
Equation of COR
square - height of rebround/height of drop
1st Class Levers
Fulcrum, Load, Effort
Speed Increaser
2nd Class Levers
Effort, Load, Fulcrum
Strength Increaser
3rd Class Levers
Fulcrum, Effort, Load
Speed Increaser
Moment of Inertia
resistance to rotational motion
Angular Momentum
angular velocity x moment of inertia
refers to the quantity of angular motion possesed by a rotating body.
Angular Velocity
rate of change in angular position of a body