# Momentum and Force

1. Nov 27, 2004

### Supaiku

2 Situations.
One: Two identical cars crash head on (inelasticly) @ v miles per hour each (in opposide directions of course).
Two: A car identical to those two cards crashes (inelasticly) @ v miles per hour into a brick wall (ie. solid and unmovable... although I have seen pics of a car that just went through a brick wall...).
Wich of the two situations results in the greatest impact force.

The forces are the same in both.
Hitting the other car (One>Two).

P=momentum
J=impulse

I figure F (impluse; whatever) =delta(P) right? So in the first situation delta P is greater since they have opposing velocites (-P and P).
But if you do P+J=0 then J=P in both cases right?

I'm pretty confused; what's right and why? HElps mes!

2. Nov 29, 2004

### marlon

in the first situation the impuls transfert is bigger due to the two moving objects...
in the second situation only the car has impulse p...

maybe this will help...

regards
marlon

3. Nov 29, 2004

### Staff: Mentor

The impulse on each car is the same in both situations.

4. Nov 29, 2004

### Supaiku

Ya, I got it now. I sorta misunderstook what was being asked... they are both right depending weather you interpert the question correctly or not :p