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August 28, 2014

August 28, 2014

Posted by **rachel** on Saturday, November 8, 2008 at 9:46pm.

- physics conservation of momentum -
**drwls**, Saturday, November 8, 2008 at 10:55pmp is the symbol for momentum. pi means initial momentum and pf is the final momentum.

To calculate p, multiply mass M by velocity, V. They tell you what M and V are. The SIGN of V changes from + to - after the ball bounces.

Now, with that explanation, see if you can answer the questions by yourself.

- physics conservation of momentum -
**rachel**, Sunday, November 9, 2008 at 12:02amyeah i kno how to calculate those 2. i got 5 and -5...

so is momentum conserved?

because change in momentum would be

5 - (-5) = 10

but some ppl are telling me momentum is conserved because they are the same values.

- physics conservation of momentum -
**kat**, Sunday, November 9, 2008 at 6:08amisn't the change in momentum: Pf-Pi?

So wouldn't that mean:

-5-5=-10?

- physics conservation of momentum -
**drwls**, Sunday, November 9, 2008 at 7:09amThe momentum of the ball is not conserved because of the force applied to it by the wall. You calculated the momentum change correctly. Ignore what "some people" say.

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