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November 01, 2025, 09:25:53 am
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Author Topic: Still not very clear about this concept  (Read 1911 times)  Share 

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kenhung123

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Still not very clear about this concept
« on: June 07, 2010, 03:10:07 pm »
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So when a question asks: What is the force/impulse exerted by A on B, do I calculate the impulse of A or B?

I surely matters because they are opposing directions.
Does this vary with different situations?
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dyaner

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Re: Still not very clear about this concept
« Reply #1 on: June 07, 2010, 03:22:09 pm »
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Good question...
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shokstar

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Re: Still not very clear about this concept
« Reply #2 on: June 07, 2010, 03:32:09 pm »
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Impulse equals change in momentum. When they ask for impulse of A on B, they ask for the change in momentum of B, therefore impulse of B.

Thats the way ive always thought of it.
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m@tty

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Re: Still not very clear about this concept
« Reply #3 on: June 07, 2010, 03:33:40 pm »
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Assuming that there are only two bodies, A and B, then the impulse by A on B is the change in momentum of B. It's like one guy is walking along(B) and then another guy(A) comes up and pushes him. The direction of the impulse is the same direction as the change in velocity. So in this example calculate the impulse of B.
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kenhung123

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Re: Still not very clear about this concept
« Reply #4 on: June 07, 2010, 03:38:08 pm »
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Alrighty and to clarify: change in velocity=final-initial?
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m@tty

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Re: Still not very clear about this concept
« Reply #5 on: June 07, 2010, 03:38:39 pm »
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Yep.
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Chavi

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Re: Still not very clear about this concept
« Reply #6 on: June 07, 2010, 04:25:02 pm »
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Momentum is conserved, so Impulse is identical on all bodies.
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Greggler

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Re: Still not very clear about this concept
« Reply #7 on: June 07, 2010, 04:26:01 pm »
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they're one and the same thing.

impulse of a = impulse of b
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lachymm

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Re: Still not very clear about this concept
« Reply #8 on: June 07, 2010, 04:33:38 pm »
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EDITTED
« Last Edit: June 07, 2010, 05:47:13 pm by lachymm »
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m@tty

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Re: Still not very clear about this concept
« Reply #9 on: June 07, 2010, 04:35:59 pm »
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Quote from: Greggler on June 07, 2010, 04:26:01 pm
they're one and the same thing.

impulse of a = impulse of b

Only in magnitude.

|impulse of a|=|impulse of b|

They are actually anti-parallel.

impulse of a = - impulse of b
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kyzoo

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Re: Still not very clear about this concept
« Reply #10 on: June 07, 2010, 05:53:34 pm »
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I think there was a question in CSE 2010 that directly examined this. And wow, I've never seen the word anti-parallel before xD
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m@tty

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Re: Still not very clear about this concept
« Reply #11 on: June 07, 2010, 05:54:19 pm »
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lol I learnt it from uni maths. :P
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Blakhitman

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Re: Still not very clear about this concept
« Reply #12 on: June 07, 2010, 06:05:38 pm »
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Change in anything is final-initial.
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TrueTears

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Re: Still not very clear about this concept
« Reply #13 on: June 07, 2010, 06:10:28 pm »
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Quote from: kenhung123 on June 07, 2010, 03:10:07 pm
So when a question asks: What is the force/impulse exerted by A on B, do I calculate the impulse of A or B?

I surely matters because they are opposing directions.
Does this vary with different situations?


where a is a point in time and b is another point in time, you can deduce what you need from this.
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kenhung123

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Re: Still not very clear about this concept
« Reply #14 on: June 07, 2010, 07:11:56 pm »
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Quote from: TrueTears on June 07, 2010, 06:10:28 pm
Quote from: kenhung123 on June 07, 2010, 03:10:07 pm
So when a question asks: What is the force/impulse exerted by A on B, do I calculate the impulse of A or B?

I surely matters because they are opposing directions.
Does this vary with different situations?


where a is a point in time and b is another point in time, you can deduce what you need from this.
TT's attempt to simplify things....
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