Oops, that's what I meant to say! So much for my correction.
I actually heard, many years ago, the higher derivatives referred to as "jerk" (3rd, as you said), "jolt" (4th) and "jounce" (5th). But that contradicts the Wikipedia article that says "jounce" is 4th derivative.
I actually heard, many years ago, the higher derivatives referred to as "jerk" (3rd, as you said), "jolt" (4th) and "jounce" (5th). But that contradicts the Wikipedia article that says "jounce" is 4th derivative.