# BIOMECHANICS linear and angular kinematics

version from 2015-10-15 15:47

## Section 1

kinematicsthe form, pattern, or sequencing of movement with no respect to time
linear displace meantchange in location, or the directed distance from Initial to final location (measured in straight line)
Linear velocityrate of change in location (displacement or change in position / change in time)
SpeedLength (or distance) / Change in time
Linear accelerationrate of change in linear velocity ( a = Change in velocity / Change of time )
Projectilebody in free fall that is subject only to the forces of gravity and air resistance
Trajectoryflight of path of a projectile
what factors that determine projectiles motion?1. projection angle 2. projection speed 3. height of projection 4. air resistance
Angle of projectiondirection at which a body is projected with respect to the horizontal
Projection Speedthe magnitude of projection velocity
relative projection heightthe difference between projection height and landing height
rangehorizontal displacement of a projectile at landing

## Section 2

instant centerprecisely located center of rotation at a joint at a given instant in time
Angular Displacementchange in the angular position or orientation of a line segment
Radian used in angular kinematic quantity conversions equal to 57.3
Angular speedAngular Distance / Change in Time
Angular Velocityrate of change in the angular position or orientation of a line segment ( w = change in position / change in time )
Angular Accelerationrate of change in angular velocity (change of w / change of time)
radius of rotationdistance from the axis of rotation to a point of interest on a rotating body
tangential accelerationcomponent of accelereation of a body in angular motion directed along a tangent to the path of motion; represents change in linear speed
radial accelerationcomponent of acceleration of a body in angular motion directed TOWARD THE CENTER OF A CURVATURE; represents a change of direction
Absolute angleangular orientation of a body segment with respect to a fixed line of reference
angular distancethe sum of all angular changes
Tangential Acceleration formula?At = V1 -V2 / T OR radius x acceleration
angular acceleration formulaAr = V^2 / T