computerages Posted January 19, 2006 Share Posted January 19, 2006 Hi everybody! As you may define "Force" as a "push or a pull", then how would you go about defining momentum in the same way. Please don't use "mass*velocity" stuff, I've read it thousands of times in my textbook and it doesn't really explain the actual meaning of momentum. Thx. Link to comment Share on other sites More sharing options...
JustStuit Posted January 19, 2006 Share Posted January 19, 2006 Tendancy to resist change in motion? Link to comment Share on other sites More sharing options...
[Tycho?] Posted January 19, 2006 Share Posted January 19, 2006 I'm not sure what you're looking for here. Moving things have momentum, because it takes a force applied to them to change their velocity. Link to comment Share on other sites More sharing options...
Severian Posted January 19, 2006 Share Posted January 19, 2006 The conserved current associated with a translation symmetry Link to comment Share on other sites More sharing options...
insane_alien Posted January 19, 2006 Share Posted January 19, 2006 Please don't use "mass*velocity" stuff, I've read it thousands of times in my textbook and it doesn't really explain the actual meaning of momentum. But thats the actual definition of momentum. Link to comment Share on other sites More sharing options...
swansont Posted January 19, 2006 Share Posted January 19, 2006 The quantity of motion. Link to comment Share on other sites More sharing options...
trvlrpsmyrph Posted January 19, 2006 Share Posted January 19, 2006 Hi everybody! As you may define "Force" as a "push or a pull"' date=' then how would you go about defining momentum in the same way. Please don't use "mass*velocity" stuff, I've read it thousands of times in my textbook and it doesn't really explain the actual meaning of momentum. Thx.[/quote'] Momentum is the product of time, weight AND direction. Put simply, an object falling for ten seconds will have more potential energy than the same object falling for five seconds. Hope this helps. Link to comment Share on other sites More sharing options...
BigMoosie Posted January 19, 2006 Share Posted January 19, 2006 For a moving object: Something twice as heavy is twice as hard to slow down. Something twice as fast is twice as hard to slow down. So momentum is directly proportional to both mass and velocity. This means that mass*velocity = momentum. Link to comment Share on other sites More sharing options...
swansont Posted January 19, 2006 Share Posted January 19, 2006 Momentum is the product of time, weight AND direction. Put simply, an object falling for ten seconds will have more potential energy than the same object falling for five seconds. Hope this helps. An object falling has less potential energy the longer it falls, and PE is not momentum. Link to comment Share on other sites More sharing options...
Sisyphus Posted January 19, 2006 Share Posted January 19, 2006 For a moving object:Something twice as heavy is twice as hard to slow down. Something twice as fast is twice as hard to slow down. So momentum is directly proportional to both mass and velocity. This means that mass*velocity = momentum. I'd change that to "bring to a stop" instead of "slow down." Link to comment Share on other sites More sharing options...
Severian Posted January 19, 2006 Share Posted January 19, 2006 I have already given you the correct technical definition (seriously!). For a particle of mass m travelling with velocity [math]\vec{v}[/math], this becomes [math]\vec{p} = \frac{1}{\sqrt{1-v^2/c^2}} m \vec{v}[/math]. If you want to link it to force, then force is the rate of change of momentum. Link to comment Share on other sites More sharing options...
□h=-16πT Posted January 19, 2006 Share Posted January 19, 2006 The conserved current associated with a translation symmetry Buggery, beaten to it. Link to comment Share on other sites More sharing options...
philcandless Posted January 20, 2006 Share Posted January 20, 2006 The far more successful antecedent of Joementum. Link to comment Share on other sites More sharing options...
computerages Posted January 21, 2006 Author Share Posted January 21, 2006 aight. now, I understand that momentum in a mass in motion, and it's the quantity of motion. But the question that is still confusing me is why on Earth we need to study momentum? What makes a difference? Link to comment Share on other sites More sharing options...
JustStuit Posted January 21, 2006 Share Posted January 21, 2006 Well, without momentum collisions would not happen because objects would stop with little force. It is very important. Link to comment Share on other sites More sharing options...
rhiannon Posted January 21, 2006 Share Posted January 21, 2006 the energy a mass has left over after a direct force has finished with it. Link to comment Share on other sites More sharing options...
huahe Posted January 21, 2006 Share Posted January 21, 2006 Those who does not understand the language of mathematics are illiterated to read the book of universe. ~~Galileo Link to comment Share on other sites More sharing options...
NeonBlack Posted January 21, 2006 Share Posted January 21, 2006 Well you know that force is "a push or a pull," so in terms of force, [math]p=\int{F}·dt[/math] Link to comment Share on other sites More sharing options...
insane_alien Posted January 21, 2006 Share Posted January 21, 2006 impulse is the integral of force with respect to time not momentum. Link to comment Share on other sites More sharing options...
Meir Achuz Posted January 21, 2006 Share Posted January 21, 2006 Those who does not understand the language of mathematics are illiterated to read the book of universe. ~~Galileo Does that include Farady, who never wrote down an equation?? Link to comment Share on other sites More sharing options...
hadi1121 Posted January 22, 2006 Share Posted January 22, 2006 Momentum can be defined as "mass in motion." All objects have mass; so if an object is moving, then it has momentum - it has its mass in motion. The amount of momentum which an object has is dependent upon two variables: how much stuff is moving and how fast the stuff is moving. Momentum depends upon the variables mass and velocity. Link to comment Share on other sites More sharing options...
lrokwild Posted January 23, 2006 Share Posted January 23, 2006 If I understand this correctly, Einstein's theory of relativity can be used to describe and ultimately define momentum. Doesn’t time have something to do with momentum? - Without time you cannot properly measure velocity, or even motion. Am I missing something.... but without time...how do you measure speed? Without speed how do you define momentum? Obviously momentum is relative to mass, speed and friction. Am I a confused SOB or what? Iv heard that if you catch up to the speed of light it would no longer exist!!!? It will seem as the light is not moving...but at a stand still...but if light is at a stand still you can’t see it? WTF! Or what about that experiment where you take a laser beam, and shine it though a vertical slit onto a wall. When the slit is open, the laser beam will appear round on the wall, then as you narrow the slit, the sides of the beam begin to narrow (as expected) and the light becomes oval shaped until you close the slit so far that all you see is the "wave" of the light and it does not end up being a tiny vertical slit of light, but rather it spreads our horizontally. I’m sorry if I didn’t explain that good enough, but if some of you know about what I’m talking about and care to explain this phenomena to me, id like that a lot! Its has something to do with quantum theory that light is not light until you see it...or something!...I'm just starting to study physics and science in general, so these ideas fascinate me but I’m unable to fully grasp them yet. Link to comment Share on other sites More sharing options...
s pepperchin Posted February 8, 2006 Share Posted February 8, 2006 basically you study momentum because it is conservative in some systems and so it makes the mathematics easier. Link to comment Share on other sites More sharing options...
s pepperchin Posted February 8, 2006 Share Posted February 8, 2006 If I understand this correctly' date=' Einstein's theory of relativity can be used to describe and ultimately define momentum. Doesn’t time have something to do with momentum? - Without time you cannot properly measure velocity, or even motion. Am I missing something.... but without time...how do you measure speed? Without speed how do you define momentum? Obviously momentum is relative to mass, speed and friction. Am I a confused SOB or what? Iv heard that if you catch up to the speed of light it would no longer exist!!!? It will seem as the light is not moving...but at a stand still...but if light is at a stand still you can’t see it? WTF! Or what about that experiment where you take a laser beam, and shine it though a vertical slit onto a wall. When the slit is open, the laser beam will appear round on the wall, then as you narrow the slit, the sides of the beam begin to narrow (as expected) and the light becomes oval shaped until you close the slit so far that all you see is the "wave" of the light and it does not end up being a tiny vertical slit of light, but rather it spreads our horizontally. I’m sorry if I didn’t explain that good enough, but if some of you know about what I’m talking about and care to explain this phenomena to me, id like that a lot! Its has something to do with quantum theory that light is not light until you see it...or something!...I'm just starting to study physics and science in general, so these ideas fascinate me but I’m unable to fully grasp them yet.[/quote'] This seems to me to be a good topic to start another thread with. Link to comment Share on other sites More sharing options...
Jacques Posted February 10, 2006 Share Posted February 10, 2006 What is the difference between momentum and energy ? Link to comment Share on other sites More sharing options...
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