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I understand that force is mass x acceleration. What I don't understand is why acceleration and not velocity. Can someone explain why exactly

- Thread starter mvan4310
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I understand that force is mass x acceleration. What I don't understand is why acceleration and not velocity. Can someone explain why exactly

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and force is actually the rate of change of momentum..you could perhaps try and read Newton's own writing on the matter to see how it was developed..I don't really know how to prove it :'(

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You should get to momentum afterwards I think

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Ill dive into my college physics book when I have the chance. Thanks I appreciate the fast replies

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Very true. That's because when the object moving with a constant velocity hits the motionless object, it decelerates and the motionless object accelerates from rest. Check this out: http://en.wikipedia.org/wiki/Impulse_(physics [Broken])

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Wow, its the simple things I seem to not think of.... LolVery true. That's because when the object moving with a constant velocity hits the motionless object, it decelerates and the motionless object accelerates from rest. Check this out: http://en.wikipedia.org/wiki/Impulse_(physics [Broken])

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- #10

russ_watters

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mvan: smart people have developed very exact definitions, such as force and momentum, acceleration and velocity, and refined them over many years...maybe even several thousand years. So no one should be surprised as they study that accumulated knowledge that it is not always obvious....especially at initial exposure.

Force is related to acceleration because a fixed unbalanced force acting on a mass causes a uniform acceleration, not a uniform velocity. A uniform velocity is associated with a fixed unbalanced force: zero.

One relationship between force and velocity: FT = MV

Force is related to acceleration because a fixed unbalanced force acting on a mass causes a uniform acceleration, not a uniform velocity. A uniform velocity is associated with a fixed unbalanced force: zero.

One relationship between force and velocity: FT = MV

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If you send something at a velocity, it will stay at the same speed if not exerted on by a force.

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I'm guessing momentum: The sun being (mass x acceleration) creating the force (distance of mass). Then that force times the velocity of the mass to give our momentum.

Then you would basicly repeat this for the sun to the galaxy's center, and so on down to the center of space. Going from smallest body of mass to the largest.

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Maybe an insight to anti-matter? It wouldnt be pushed out and compressed or anything. Since the mass of the solar system is accelerating and spreading out It would actualy be bringing more of the anti-matter/space closer to its core. In other words a displacement of mass and space, the distance between mass.

So the velocity would be the suns force constant rate of speed, then times the force of the anti-matter/space to equal our momentum.

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The earth has an http://en.wikipedia.org/wiki/Angular_momentum" [Broken].

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Why not if a collision involves changing the sate of ones motion?

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Three reasons:Why not if a collision involves changing the state of ones motion?

1) Impulse is not a force, it is a measure of change of momentum. Divide it by the time period it changes in, and you get the average net force.

2) Notice I said

3) Notice I said

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I guess I am still speaking simplistically then. If impulse is the measure of change in momentum and you get the average change (some non-infinitesimal time interval), you get a average net force, correct? If so, I guess going back to a simplistic mode - ignoring what could be the components of the net force - it is,Three reasons:

1) Impulse is not a force, it is a measure of change of momentum. Divide it by the time period it changes in, and you get the average net force.

2) Notice I saidnetforce. The components of this force can be many different things.

3) Notice I saidaverageforce. In a collision, the net force often changes during the duration of the collision.

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If you mean average changeI guess I am still speaking simplistically then. If impulse is the measure of change in momentum and you get the average change (some non-infinitesimal time interval), you get a average net force, correct? If so, I guess going back to a simplistic mode - ignoring what could be the components of the net force - it is,on that level of an ignorant mind- a force, right? Maybe a am being a little to philosophical? Nonetheless, I think I understand where russ was getting at now with it being simplistic from what you have said. :)

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