Re: Why the planes did not crumple

On Sat, 10 Jun 2006 02:14:16 -0500, Brian Tung <brian@xxxxxxx> wrote:

LarryG wrote:
Very good response. (I expect no less from you!;-)

However, I somewhat disagree with your main point, that time is
a factor.

In the case of the card going through the carrot, if the card
had enough momentum behind it, and struck the carrot at the
same angle, then the result would be the same, no matter what
the speed or time (all other conditions remaining the same.)

As for the carrot going through the card, you can get similar
results, if the momentum is sufficient to push the carrot
through the plane-face of the card. If the carrot strikes
the edge of the card, then it will get cut.

Huh?! Momentum is speed times mass. Speed is distance over time. It
cannot at once be about momentum and *not* be about speed or time.

Again, orientation, and strength along the axis of motion
matter greatly, and not so much time.

I don't see how you can attribute the result (in part) to momentum, and
at the same time say that time is not a factor. Maybe I misunderstand
what you mean by "time."


Reality does not scale very well in any dimension that I'm aware of.
The momentum I spoke of would necessitate a larger mass for a slower
speed. And factors such as the rate of propogation of a tear
further complicate the analogy.

Perhaps what I should have said is that the card exhibits its structural
strength and integrity aligned with the plane of its broad face. Hence
its edge can cut through seemingly hard objects, like carrots. However,
a card is not likely to cut through a steal anvil unless it is going
several thousand mile per hour, or more.

The card is weaker when the force is applied at right angles to the face
plane.

But you are correct. Time and speed can vary the results.





--
Cheers,
Larry G.

Calling Austin HOME since 1982!
.

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