From: W. W. Simpson
To: Teacher2Teacher Public Discussion
Subject: Third Derivative
In Cam Design: If f(t) = Distance 1st derivative = Velocity = Rate of change of D(t) 2nd derivative = Acceleration = Rate of change of V(t) 3rd derivative = Jerk = Rate of change of A(t) 4th derivative = Jounce = Rate of change of Jk(t) Jerk can be thought of as an Impact like a strike with a hammer and is to be avoided for smooth motion and the avoidance of wear of mechanical parts.
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