Biomechanics Exam 1

Biomechanics

application of mechanical principles in the study of living organisms

Kinematics

description of motion

Kinetics

explanation of mation (the why)

Safety

prevention of injury

Effectiveness

Max of outcome (performance)

Efficiency

fast and best way of force exertion and engery expenditure

Simple Motions

linear and angular

Linear motion

something moving in the same direction with the same trajectory and oreintation- iceskating

Angular Motion

orientation constatly changes around an axis of rotation- leg raise, gymnastics

Mass

quantity of matter composing a body- scalar quantity

Center of Mass

a point around whihc tha mess of body is balanced in all directions

Force

key concpet- push/ pull on a body to cause motion- vector quant.

Properties of force

magnitude, direction, point of application

Vector Quantity

has magnitude and direction

Scalar quant.

magnitude only

Pressure

amount of force acting over a unit area, Pascal (Pa), P= F/ contact area

Torque Moment arm

line perpendicular to the axis of rotation and the line of action

Torque Moment

Rotary force that produce angular motion, F x moment arm, CCW (+), CW(-), Nm