I think hardness and momentum give you surface area (since the hardness will
imply how much the object deforms, which will give you the area of impact).
Of course you have to consider the hardness of both objects, too.
- Marcel

On Fri, Jul 25, 2008 at 8:56 AM, Tom=E1s =D3 h=C9ilidhe <toe@lavabit.com> w=
rote:

>
>
> Walter Banks wrote:
> > The answer to your question is neckles is the product of mass and
> > velocity.
>
>
> I don't think so.
>
> I rather get hit with a 5 kg pillow travelling at 40 mph, than a 100
> gram golf ball moving at 30 mph, even though the former has far more
> momentum.
>
> I think you've to take into account:
>    * Momentum
>    * Hardness
>    * Surface are of impact
>
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