Kinematics Terms
Kinetics is the study of the geometry of the motion.
Displacement
(s): The change
in position.
Velocity
(v): The change in
displacement.
Acceleration
(a): The change
in velocity.
Angular
displacement (θ):
The change in angle.
Angular
velocity (ω): The
change in angular displacement.
Angular
acceleration (α):
The change in angular velocity.
Tangential acceleration
(at):
The tangential component of acceleration is the result of the time
rate of change in the magnitude of velocity. This component acts in the
positive s direction if the particle’s speed is increasing or in the
opposite
direction if the speed is decreasing.
Normal acceleration (an):
The normal component of acceleration is the result of the time rate
of change in the direction of the particle’s velocity. This component
is always
directed toward the center of curvature of the path.
Translation:
Occurs if every
line segment on the body remains parallel to its original direction
during the
motion. Rectilinear motion refers to straight line motion while
curvilinear
motion refers to curved line motion.
Rotation:
A body rotates
about a fixed axis in a circular path.
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