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# Biomechanics

### Acceleration

Acceleration rate of change of velocity
Acceleration equation Vfinal - Vinital / ΔT = ΔV / ΔT
increasing velocity - positive acceleration positive direction
decreasing velocity - negative acceleration positive direction
increasing velocity - negative acceleration negative direction
decreasing velocity - positive acceleration negative direction
Positive net force = positive acceleration
At peak of the a jump, V=0. when V=0 and CG = 0. What is your acceleration? Negative acceleration because you have body weight.
Negative net force = negative acceleration
Force the push or Pull on the body measured in Newtons (N)
Law #1 Law of inertia
Law #2 Law of acceleration
Law #3 Law of action/reaction
Law of inertia a body will continue in its state of rest or motion unless a net force acts on it
Law of acceleration if net force acting on a body is not zero, the body will experience acceleration proportional to the force applied ( ∑F = m X a )
Law of action/reaction for every action, there is an equal & opposite reaction
if GRFv = W ∑F = 0 ( no net force) & Acg =0
if GRF v > W ∑F > 0 (net force upwards) & Acg > 0 (positive)
if GRFv < W ∑F < 0 (net force downward) & Acg < 0 (negative)
∑F = 0 & Acg =0 -CG motionless (stationary) -CG moving with a constant velocity
∑F = 0 > & Acg =0 -speed of CG is INCREASING as it moves UPWARDS (+ direction) -speed of CG is DECREASING as it moves DOWNWARD (-direction)
∑F = 0 < & Acg =0 -speed of CG is DECREASING as it moves UPWARDS (+ direction) -speed of CG is INCREASING as it moves DOWNWARDS (- direction)
Created by: rmart11