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Biomechanics
Definitions
19
Physics
Undergraduate 2
01/30/2010

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Term
Kinematics
Definition

The study of the description of motion, including considerations of space and time.

What the motion looks like, includes how far the motion travels (space), and how fast the motion travels (time).

Term
Kinetics
Definition
The study of action of forces (create movement). Why motions happen.
Term
Statics
Definition
Branch of mechanics dealing with systems in a constant state of motion. Either no motion (rest) or motion of constant velocity (no change in direction or speed).
Term
Dynamics
Definition
Branch of mechanics dealing with systems subject to acceleration. Change in motion (speed up/slow down) or direction (turning).
Term
Qualitative
Definition
General. No numbers. EX: "Lower."
Term
Quantative
Definition
Specific. Use numbers. EX: "90 cm lower."
Term
Scalar
Definition
Exclusively with amount (magnitude). EX: Time, temperature.
Term
Vector
Definition
Describe with amount (magnitude) and direction (velocity). EX: Weight, force.
Term
Inertia
Definition
Tendancy of a body to resist a change in its state of motion (does not want to change its motion, whatever the motion may be). The more mass, the more inertia.
Term
Mass
Definition
Scalar. Quantity of matter contained in an object.
Term
Force
Definition
Vector. Push or pull. The product of mass and acceleration.
Term
Centre of Gravity
Definition
Point around which a body's weight is equally balanced, no matter how the body is positioned.
Term
Weight
Definition
Vector. Attractive force that the earth exerts a body.
Term
Torque
Definition
Vector. Rotary effect of a force.
Term
Impulse
Definition
Vector. Product of a force and the time over which the force acts.
Term
Distance
Definition
Scalar. Measured along the path of motion.
Term
Linear Displacement
Definition
Vector. Measured in a straight line from position 1 (initial) to position 2 (final).
Term
Speed
Definition
Scalar. The distance covered divided by the time taken to cover it.
Term
Velocity
Definition
Vector. The rate of change in a position that occurs during a given period of time.
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