Quote:
Originally Posted by RedDevil
True. As momentum also takes the directional component into the equasion. Boldly said it is kinetic energy plus a direction. I meant to say kinetic energy, it is just hard not being a native English speaker. The energy level in momentum is known, it all comes down to hair-splitting on definitions.
I will not discuss these points any further. It just distracts from the topic.
Readers with a strong knowlegde of physics don't need this information anyhow, and those who don't will not likely be convinced by either of us.
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While I agree to a degree ... I'll disagree on a few thing ... And I think it is more useful to people to understand it correctly than not... that makes one more likely to be able to maximize the pros an minimize the cons when one understands how it works... as such I don't think it detracts at all ... I think it adds to the knowledge base that is completely relevant to this thread.
Momentum is not just kinetic energy with direction ... it is not splitting hairs over definitions ... they are different things ... as different as blue and red are both colors but are not the same thing.
Yes both refer to movement but they are not the same thing ... momentum is never measured in joules ... it is not a term for energy.
For example:
The basic equation for momentum of a moving object is given by p=mv.
And it does not give you an p of momentum in joules ... because momentum is not energy.
The basic equation for Kinetic Energy of a moving object is given by KE=1/2mv^2 ... and as energy it does give you Kinetic in joules if your other units are matched.
There is a significant difference between them.
If m=1 for both
Initial V = 1 for both
Then Momentum p = 1
Initial Kinetic Energy = 1/2
If the speed ( v) doubles to 2
Momentum p = 2
Kinetic energy = 2
If speed ( v ) triples to 3
Momentum p = 3
Kinetic Energy = 4.5
etc ... they do not grow at the same rate ... they are not measuring the same thing, even if they are both referring to a moving body.