Impulse vs Fnet relation to damage?

  • Thread starter mrneuro
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  • #1
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Main Question or Discussion Point

what does more damage an object w/ a high acceleration or a greater momentum

i was watching one of my favorite tv shows "Justified" and i started to wonder would a bullet moving at a greater acceleration hence greater force (F=ma) inflict more damage or would a bullet w/ a greater velocity, hence momentum (p) and impulse (Δp=Favgt)

im pretty sure the bullet will have the greatest acceleration as it leaves a gun
what about Δp?

and so i guess my question is does impulse generate more damage or is it more newtonian in that a greater acceleration impacts more damage

obviously m of bullet is same

So i guess my question is F=ma vs Δp (Favgt) which does more damage in terms of a bullet

this has been bothering me for about a week now and i can't seem to convince myself one or the other because im pretty sure Fnet has an impact on Favg but then i tell myself the max acceleration leads max velocity

HELP
 

Answers and Replies

  • #2
tiny-tim
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welcome to pf!

hi mrneuro! welcome to pf! :smile:

a bullet stops accelerating as soon as it leaves the gun …

from then on, it's slowing down …

the damage is caused by the momentum, and by the way the bullet deforms
 
  • #3
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thanks!

sorry but one more question would a bullet at maximal velocity say 30 m from the bullet tip cause more damage

or a bullet just exiting the gun?

i guess im asking what is the reference for p initial for the Δp calculation?
 
  • #4
tiny-tim
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i guess im asking what is the reference for p initial for the Δp calculation?
p initial is the momentum immediately before it hits the target (and p final is 0) :smile:
 
  • #5
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p initial is the momentum immediately before it hits the target (and p final is 0) :smile:
Sweet thanks!

so greatest impulse wil be found at max velocity
 

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