What would be the best equation to find momentum?

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Discussion Overview

The discussion centers around identifying the best equation for calculating momentum, exploring various definitions and contexts in which momentum is considered. Participants discuss classical and relativistic perspectives on momentum.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • Some participants propose the equation \(\vec p = m \vec v\) as a standard definition for momentum, applicable when mass and velocity are known.
  • Others mention the equation \(\vec F = \frac{d\vec p }{dt}\) as a relationship between force and momentum change.
  • A participant questions the context by asking, "The momentum of what? Given what?" suggesting that the definition may depend on specific conditions.
  • There is a query about the units of momentum, with a participant stating that momentum is measured in kilogram*meters/second (kg*m/s).
  • A later reply introduces a relativistic equation \(E^2 - (pc)^2 - p^2c^4 = 0\), indicating a different approach to understanding momentum in the context of energy and momentum in relativistic physics.

Areas of Agreement / Disagreement

Participants express varying views on the best equation for momentum, with no consensus reached. Different contexts and definitions are acknowledged, leading to multiple competing perspectives.

Contextual Notes

The discussion highlights the dependence on definitions and contexts for momentum, with classical and relativistic frameworks being considered. There are unresolved aspects regarding the applicability of different equations based on specific scenarios.

lphockey14
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what would be the best equation to find momentum?
 
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Probably Use

[tex]\vec p = m \vec v[/tex]
Or

[tex]\vec F =\frac{d\vec p }{dt}[/tex]
 


Originally posted by lphockey14
what would be the best equation to find momentum?

The momentum of what? Given what? The definition of momentum of a particle is

[tex]\mathbf{p} = m\mathbf{v}[/tex]

Once you know the mass and the velocity you know the momentum.
 
What are the units momentum is measured in?
 
Originally posted by Guard
What are the units momentum is measured in?

Momentum is measured in kilogram*meters/second (kg*m/s)
 


Originally posted by lphockey14
what would be the best equation to find momentum?


E^2 - (pc)^2 - p^2c^4 = 0
 

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