Cannot see where potential enegy comes from in classical mechanics

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SUMMARY

The discussion centers on the derivation of equations related to force, energy, and potential energy in classical mechanics. The key equations are F=ma, E=(p^2)/(2m) + U, and ma=-del U. The user seeks clarification on how potential energy (U) is introduced in equations 2 and 3 based solely on the fundamental equation of motion (F=ma). The conversation emphasizes the distinction between potential (U) and potential energy.

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  • Understanding of Newton's Second Law (F=ma)
  • Familiarity with the concepts of kinetic energy and potential energy
  • Basic knowledge of momentum (P) in classical mechanics
  • Ability to interpret mathematical equations in physics
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  • Study the derivation of kinetic energy from momentum (E=(p^2)/(2m))
  • Explore the relationship between force and potential energy (ma=-del U)
  • Review the concepts of conservative forces and their relation to potential energy
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Students of physics, educators teaching classical mechanics, and anyone interested in understanding the foundational concepts of force, energy, and potential energy in physical systems.

vectorcube
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Homework Statement



F=force, a=acceration, m=mass, U potential energy, P momentum, E=energy

How do derive 2 and 3 from 1( see below).


Homework Equations



1) F=ma,

2) E= (p^2)/(2m) + U,

3) ma = -del U

The Attempt at a Solution



I try to understand why U pop into the equation for 2 and 3 given only 1, but i failed. I do not know how to introduce the notion of potential energy given only 1.
 
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Welcome to PF!

vectorcube said:
… U potential energy, …

Hi vectorcube! Welcome to PF! :smile:

U is the potential, not the potential energy …

see the PF Library for more details. :wink:
 
Oops scratch my post, wrong derivation
 
Last edited:

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