Friday

August 1, 2014

August 1, 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.

**Related Questions**

physics - A tennis ball with a speed of 6.0 m/s is thrown perpendicularly at a ...

Physics - A 50g tennis ball is thrown with a velocity of 12 m/s. It strikes a ...

Physics - From the window of a building, a ball is tossed from a height y0 above...

Physics - A ball is thrown horizontally from the roof of a building 29.7 m high ...

Physics - A tennis ball with a velocity of 24.4 m/s is thrown perpendicularly at...

physics - a 1.0 kg ball is thrown horizontally with a velocity 15 m/s against a ...

physics - Suppose a ball of mass m is thrown vertically upward with an initial ...

Physics - A ball is thrown towards a vertical wall from a point 2m above the ...

Physics - What is the velocity at the midway point of a ball able to reach a ...

physics - A tennis ball with a speed of 12.5 m/s is moving perpendicular to a ...