movement analysis + projectile motion

three ways movement analysis can help individuals

• sports performance

• rehabilitation

• prevents and avoids injuries

prepatory phase

the initial stage when the athlete prepares mentally and physically before the movement begins

force production

certain muscles synchronize in order to begin moving the skeleton to generate force

critical instant

the specific movement when the accuracy power and efficiency of the movement is determined

follow through

for discrete only, the body continues the movement after the force has been applied to reduce injury

recovery

continuous only, similar to follow through but body moves into the next prepatory phase to repeat the cycle

what two factors influence projectile once the forces to accelerate the object are no longer applied

gravity, and air resistance (impacts the horizontal distance)

impact angle of projection

• large angles = greater vertical impact

• low angles = greater horizontal impact

impact of initial velocity

with similar launch angles, faster objects has a greater horizontal distance

impact of height release

height allows the object to travel greater horizontal distance before gravity brings object back down

air resistance and factors that influence it

AR: the frictional force that pushes against an object as it moves through the air

• factors that influence it: large surface areas and non-aerodynamic shapes experience greater air resistance than small surfaces and aerodynamic shapes

mass to air resistance ratio, how does it influence the horizontal distance of a projectile?

• large mass/small air resistance = more distance

• small mass/large air resistance = less distance

three factors that influence horizontal distance

initial launch velocity, angle, height

center of mass definition

an imaginary point, where mass is evenly distributed

• ex: human = stomach (anatomically)

• men may have a higher center of mass due to more muscle mass

three aspects that the center of mass determines/influences

• the stability of an individual

• the path a projectile follows

• the axis of airborne rotations (the turning or spinning movements an object or person makes while completely off the ground)