What kind of units do you use in physics to describe how hard a smack
something got, or how hard a smack something can sustain?
I mean let's say you're selling tripple-glazed windows, and you're
marketing them as being "virtually indestructible". Your ad for them
might say that they can sustain a smack as high as 400 neckles. I'm just
wondering what a "neckle" would be? Would it be force? Or pressure? Or
impulse?
Let's say there's a golf ball whose mass is 50 grams, and it's moving
through the air at 200 metres per second, and let's say it hits one of
these windows.
Speaking more from human intuition rather than a knowledge of physics,
it seems to me that you've to take into account the following in order
to determine just "how hard a smack" the window got:
* The mass of the golf ball
* The speed of the golf ball
* The hardness of the golf ball
* The surface area of impact
Well the momentum of the golf ball is 200 x .05 = 10 N s
Let's say that the golf ball's made of titanium. Titanium has a hardness
of 6 on the Mohr's scale.
I don't know how you'd calculate the impact surface area seeing as how
the golf ball is a sphere... hmm... but anyway, is there any sort of
unit that gives you an idea of how hard a smack something got? It's be
cool to be able to say "the helicopter crashed into the building with
1700 neckles".
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