+
A abduction
Movement of a segment in the frontal plane away from the midline of the body
acceleration
The rate at which velocity changes
adduction
Movement of a segment in the frontal plane toward the midline of the body
afferent neuron
Neuron that carries impulse toward the central nervous system; sensory neuron
agonist
Muscle primarily responsible for motion; prime mover
angle of attack
The angle between the long axis of a projected object and the direction of airflow
angle of incidence
The angle at which an object strikes a hard surface
angle of projection
The angle between the horizontal and the initial velocity vector of a projectile
angle of pull
The angle between the mechanical axis of bone and the line of pull of a muscle
angle of reflection
The angle at which an object will leave a hard surface after striking it
angular acceleration
The rate at which angular velocity changes
angular displacement
Any change in angle
angular impulse
A torque applied over some period of time
angular momentum
The quantity of angular motion a lever possesses, equal to the product of the moment of inertia and the angular velocity
angular velocity
The rate at which angular displacement takes place
anteroposterior (AP) axis
The axis that passes horizontally from front to back, perpendicular to the frontal plane
Archimedes' Principle
Law governing buoyancy, which states that a body immersed in water is buoyed up by a force equal to the weight of the fluid displaced by the body
+
B backward tilt
Pelvic motion in which the posterior surface moves somewhat backward and downward
base of support
Any part of the body in contact with the supporting surface and the intervening area
Bernoulli's Principle
Law governing fluid forces, which states that when flow velocity is high, fluid pressure is low, and when flow velocity is low, fluid pressure is high
bilateral axis
The axis that passes horizontally from side to side, perpendicular to the sagittal plane
biomechanics
The study of the mechanics of biological systems
boundary layer
A layer of fluid that is immediately adjacent to the surface of an object
buoyancy
An upward force that acts to support a body immersed in water
+
C cardinal plane
A primary plane, one that passes through the center of gravity
center of buoyancy
That point in the body at which the upward force of buoyancy acts
center of gravity
The “balance point” of the body; the center of mass; the intersection of the three cardinal planes
centrifugal force
The “center-fleeing” force acting on an object undergoing circular motion; a reaction force to centripetal force
centripetal force
The “center-seeking” force constraining an object to a circular path
coefficient of elasticity
A number that represents the ability of a material to resist deformation and to return to its original state
coefficient of friction
A number that represents the resistance to rolling or sliding motion that exists between any two surfaces
coefficient of restitution
See coefficient of elasticity
compression
Force ...