Re: To you physicists -


AKA gray asphalt wrote:
> <oconnell@xxxxxxxxxxxxxxxx> wrote in message news:1134395638.726259.124750@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
[snip]
> > Which is to say that taking the average of any acceleration
> > or velocity through impact would be counter productive as
> > only the intial value probably is significant. The delta in
> > velocity will tell you the available energy to do work but
> > some of that work will be in deformation so it won't directly
> > tell you about ball velocity.
>
> Then deformation isn't potential energy?

Not entirely. The elastic portion is, but there is an inelastic
portion that actually consumes energy. (Technically it
actually heats up the ball).

> I can't get my mind
> around this as I've always pictured the rebound of the ball
> as adding distance. But it feels like an idea that is pleasant
> but not correct, probably.

The ball leaves the face faster than the face is moving because
the ball stores a bit of energy (in elastic deformation) and then
releases it which allows it to accelerate off the face. However, the
process of deforming in the first place consumes some energy. I
strongly suspect that much of the improvement in ball technology
lately has been in a much more efficient process of deformation
that consumes less energy.

.

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