# Help on Momentum

Discussion in 'Physics & Math' started by BeAnBeAn, Jan 9, 2007.

1. ### BeAnBeAnRegistered Member

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In order for a moving bowling ball and a moving Ping-Pong ball to have the same momentum what must happen to the speed of both-balls?

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3. ### PeteIt's not rocket surgeryRegistered Senior Member

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Momentum is the product of speed and mass, right?

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5. ### CANGASRegistered Senior Member

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Right. p = mv.

Therefore if p is to remain constant, if we increase m by some factor, then we must decrease v by exactly the same factor.

So, if the bowling ball has, say, 256 times the mass of the ping pong ball, the ppb must be moving at a velocity 256 times faster in order to have the same momentum as the bb.

Last edited: Jan 10, 2007

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7. ### KronMaxwell's demonRegistered Senior Member

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It's also important to remember the difference between kinetic energy and momentum in these problems.

8. ### EndLightEndThis too shall pass.Registered Senior Member

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I think BeanBean got his/her answer.

9. ### PeteIt's not rocket surgeryRegistered Senior Member

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Way to do it for her (him?), CANGAS.
Homework problems (or anything that looks like one) shouldn't be just answered like that. Educatoin is about encouraging independent thought, y'know?

10. ### PeteIt's not rocket surgeryRegistered Senior Member

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Way to do it for her (him?), CANGAS.
Homework problems (or anything that looks like one) shouldn't be just answered like that. Educatoin is about encouraging independent thought, y'know?

11. ### CANGASRegistered Senior Member

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EducatOIn is about helping someone to understand something that they do not previously understand. My elementary education would have had much fewer snags if a few so-called teachers had been aware of helping us rather than only saying a fact and turning away.

There is no better teaching tool than giving a learner a worked out example so that they have every opportunity to understand what is supposed to be going on. It is a pity that seemingly so few of your own teachers knew that.

Right?

12. ### PeteIt's not rocket surgeryRegistered Senior Member

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10,167
No, a better teaching tool is to allow the learner to discover their own approach.

The constructivist approach to education is something good educators love.

13. ### CANGASRegistered Senior Member

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I have very strong feelings about having a positive and helpful approach to education of any learner.

Enough of this off-topic jibber jabber in this thread. I might be willing to discuss education priorities in the proper venue. If you start a thread on the subject and I find it then maybe I can somehow come up with useful comments.