# Biomechanical Model Jumping

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 Author: Anonymous ID: 237328 Filename: Biomechanical Model Jumping Updated: 2013-09-27 03:02:41 Tags: study Folders: Description: study dis shit betch Show Answers:

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1. Projectile Motion Principle

"three forces influence the movement of a projectile when it is in air"

• weight (W)
• drag force()
• lift force()

• "maximum horizontal distance"
• projectile speed

time in air

"time in air"

• projectile speed
• relative projection height
• projection angle

"maximum vertical height"

• projectile speed
• projection angle
2. Sum of Joint Linear Speeds Principle

"a body's total linear speed is the result of an optimal combination of individual joint linear speeds"
3. Linear Speed - Angular Velocity Principle

An increase in linear speed (s) of a point on a rotating body component is caused by...

an increase in the body component's angular velocity (ω)

and/or

an increase in the radius of rotation ()

EQUATION: ()
4. Joint Torque Principle

an increase in joint torque () is caused by...

an increase in a muscle force () pulling on the bones that are held together at the joint

and/or

an increase in the moment arm ()

EQUATION: ()
5. Angular Inertia Principle

a decrease in a body component's angular inertia (I) is caused by...

a decrease in the body component's mass (m)

and/or

a decrease in the radius of resistance()

EQUATION: ()
6. Angular Impulse - Momentum Principle

an increase in angular velocity (ω) of a body component being rotated is caused by...

an increase in joint torque () applied to the body component

and/or

an increase in the application time (t) of the joint torque

and/or

a decrease in the body component's angular inertia (I)

EQUATION: ()
7. Action - Reaction Principle

"for any muscle to create its greatest amount of muscle force, an oppositely directed external force of equal magnitude must exist"
8. External Forces Principle

"whenever the body is in contact with the ground there are two ground reaction forces (one vertical and one horizontal) that can oppose the muscle forces created inside the body"
9. Friction Force Principle

an increase in friction force is caused by...

an increase in the coefficient of friction (μ)

and/or

an increase in the vertical ground reaction force ()

EQUATION: ()

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