Kinetics and Forces Flashcards
the study of motion under the influence of forces
kinetics
change in position over time
motion- displacement
linear displacement
translatory motion
The segment moves in a curved path around a fixed axis (AoR)
rotary motion
angular displacement
rotary motion
the study of motion without regard to the forces that cause it
kinematics
sagittal plane moves around
x axis
transverse plane moves around
y axis
the frontal (coronal) plane moves around
z axis
displacement per unit of time regardless of direction
speed
distance traveled in a certain time in a certain direction
velocity
change in velocity per unit of time
acceleration
a push or pull
force
4 components of force vectors
magnitude
direction
line of action
point of application
force acting to rotate a body around an axis
moment
tends to cause or change rotary movement
moment
effect of a rotary force depends on:
2
magnitude of the force
moment arm length
a moment is also known as
torque
depends on the mass of the object
magnitude
gravity always acts in what direction
downward
The point at which the total mass of abody is considered concentrated
CoG
human body CoM
S2
what two things affect stability
base of support
line of gravity relative to BOS
newtons 3rd law
for every action, theres an equal and opposite reaction
