Re: That jerk again!

[brian whatcott <inet@intellisys.net>]

At 11:54 11/19/97 -0500, John Gastineau wrote:

> In rolling the car up a hill, it matters not when you jam on the brakes (at
> the top or before); you are introducing a sudden change in acceleration, a
> jerk, and we feel that pressure change. It is simply surprising to have it
> happen at zero velocity. The value of the velocity at a given instant has
> nothing to do with its first or second derivative. 
> ...
> John E. Gastineau  

A person who bases his conclusions on experimental tests is not to
be trifled with; but I fancy he overreached his data - or wrote a little
hastily when he claims that the value of the velocity [ when the brakes are
applied] has nothing to do with the consequential acceleration, or ITS rate...

John will easily agree that he could reverse the sign of the acceleration
caused by braking by choosing his moment on the velocity slope of constant
deceleration...

Regards

brian whatcott <inet@intellisys.net>
Altus OK