14:440:222 Dynamics
(Lecture Note #7)
Instructor: Prof. Peng Song
Rutgers University
Today’s Lecture
• Kinetics of particle systems in
n-t
coordinates

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Normal-Tangential Coordinates
When a particle moves along a
curved path, it may be more
convenient to write the
equation of motion in terms of
normal and tangential
coordinates.
The normal direction (n)
always
points toward the path’s
center of curvature.
In a circle, the center of curvature is the
center of the circle.
The tangential direction (t) is tangent to the path, usually set
as positive in the direction of motion of the particle.