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Old July 11th, 2007, 17:35   #37
WhatTheWho
 
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Join Date: Dec 2002
Location: Edmonton, AB
Quote:
Originally Posted by Flatlander View Post
This is due to momentum! Momentum is loosely defined as the difficulty to stop an object. So we're both correct in a way, I believe.
Actually, it's not due to momentum.

I could have a 1g sphere traveling at 10m/s compared to a 10g sphere traveling at 1m/s; momentum would be the equal. But, the 1g sphere will decelerate faster than the 10g sphere.

Quote:
Originally Posted by Flatlander View Post
It appears to me you haven't studied mechanics/dynamics extensively as you say impact POWER. Power and energy are, again, very different! Units of energy are in joules, units of power are joules/second. Not meaning to cut you down; maybe just a mental lapse...
Just a lapse. I forgot to throw quotation marks around "impact power" as it was the term everyone was throwing around in this thread to define the amount of "hurt" a person feels. I even quoted it in my last remarks of my previous post.

Quote:
Originally Posted by Flatlander View Post
Close...if you fired bb's of different masses at the SAME velocity, the one with the greater mass will have it's velocity decrease at a slower rate.
What you say is true, but the concept of higher velocity creating for air resistance is what I'm trying to indicate.

My statement holds true as I am wording it to keep in context of the debate. The question that I gathered from this thread was, given the same gun which would fire off different mass BB's at consistent kinetic energies, the lighter BB would have a higher FPS than the heaver BB.

Quote:
Originally Posted by Flatlander View Post
Can't completely comment on this except you have to be careful. You're finding its acceleration (or deceleration in this case) which deals with FORCES (F=ma) and then talking about energy then mistake the term "impact power" which should be (I think) impract energy as they would be completely different.
As I mentioned, I forgot to throw quotation marks around "impact power."
Follow through the equation itself with a set of numbers for a greater mass BB and a smaller mass BB, ensuring that the velocities of both will produce the same kinetic energy. The lighter BB will have more air resistance.

If you doubt the equation, it can be looked up on google or such.

Quote:
Originally Posted by Flatlander View Post
I'm not completely sold that impact energy (kinetic energy) is the definitive way of saying what will hurt more. I could be wrong and will look into it as I'm quite curious....
True, kinetic energy is not the definitive was way of saying what will hurt more.

I would think that Impulse would be quantities that would need to be calculated in terms of how much "hurt" a BB has, given that it is your body which needs to decelerate the BB to zero.
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