ARTICULAR STABILITY TERMS Flashcards
represented by arrows indicating the direction of a force and the length of the arrow indicated by the magnitude
vectors
the resultant vector sum of forces that act upon a given mass
net force
the vector represents motion in one direction
linear motion
the vector represents the force along one axis or linear in nature
axial force
weight on the end of a rope traveling in a circular path
rotational motion
newtons first law of motion
inertia?
the net moment acting on a mass is equal to the moment of inertia times the angular acceleration
tendency of something to remain at rest
newtons second law of motion
F=ma
newtons third law of motion
to every action there is an opposite and equal reaction
what are the parts of a lever system?
lever point of application of effort effort effort arm point of acceleration of resistance resistance resistance arm
name the part of the lever system:
rigid bar that revolves around an axis or fulcrum
lever
name the part of the lever system:
point at which contracting muscle is attached to the moving bones
point of application effort
name the part of the lever system:
force acting at its point of application represented by a vector
the vector is always the muscle
effort
name the part of the lever system:
movement arm for the effort
distance from the axis of rotation to the point of muscle attachment
effort arm
name the part of the lever system:
center of gravity of the mass of the lever
point of acceleration of resistance
name the part of the lever system:
force acting at its application point having a vector in the opposite direction of the effort
resistance
name the part of the lever system:
moment arm for resistance
this is the distance from the axis of rotation to the resistance vector
resistance arm
name this class lever?
effort arm greater than resistance arm
magnifies force
second class lever
name this class lever?
resistance arm greater than effort arm
magnifies speed
first and third class lever
state of partial dislocation
subluxation
name this force acting on weight bearing bones?
pushing bones together enhances osseous stability
compression force
name this force acting on weight bearing bones?
rotating bone abnormally against its axis of motion enhances instability
rotational force
name this foot type
increased angulation of force leading to decreased stability
pronated foot
name this foot type
decreased angulation of forces leading to increased stability
supinated foot
