Kinetic theory of gases momentum

  • Thread starter lukasz08
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  • #1
10
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p=momentum=(mass*volume)

delta px = pf - pi
mvf - mvi
mvx - (-mvx) <<<<---- where does this second negative come from ? what am i missing here?
2mvx


in my book it shows that
delta px = - mvx - (mvx) = -2mvx
 

Answers and Replies

  • #2
Doc Al
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When a particle bounces elastically off a wall, its velocity (and momentum) changes direction. Does that help?
 
  • #3
10
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yes i understand that so the second negative appears after the particle has hit the wall resulting in the 2mvx ?
 
  • #4
10
0
ok i got it mvi = -mvf therefore -mvi - mvf = -2mvx
 

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