What are the equations for the strong and weak force, like how for the Electrostatics the equation is $F_c= k*Q*q/(r*r)$. I understand to an extend what the strong and weak forces are. However, I would like to know what the equations for calculating the forces. Also can you explain how the equations works and define the variables.

I understand that they may not be as simple and as pretty and the electrostatic one.

  • 3
    $\begingroup$ Half of this question duplicates physics.stackexchange.com/q/8452 $\endgroup$ – dmckee --- ex-moderator kitten Mar 8 '15 at 22:41
  • 8
    $\begingroup$ Also relevant: xkcd.com/1489 $\endgroup$ – dmckee --- ex-moderator kitten Mar 8 '15 at 22:41
  • $\begingroup$ @dmckee link only explained for the strong force. By any chance do you happen to know the question for the weak force? $\endgroup$ – ThisIsMe Mar 8 '15 at 23:28
  • 2
    $\begingroup$ The weak interaction acts over such short distances and so, well, weakly compared to the strong and electromagnetic interactions that there is nothing to be gained by expressing it in a "as a function of distance" form. The only way anyone bother to write it down in as a Lagrangian or Hamiltonian contribution. I generally campaign for speaking of "four fundamental interactions" rather than "four fundamental forces". $\endgroup$ – dmckee --- ex-moderator kitten Mar 8 '15 at 23:31
  • 3
    $\begingroup$ The question is essentially a duplicate of physics.stackexchange.com/q/39229/2451 $\endgroup$ – Qmechanic Mar 8 '15 at 23:47

There is and there isn't an equation. What I mean is that there is no universal equation for all cases. For example, the equation for strong force $V(r) = - \frac{4}{3} \frac{\alpha_s(r) \hbar c}{r} + kr$ only applies to quarkonium. This is different for the gravity equation which applies in all cases.

  • 1
    $\begingroup$ Can you explain what these variables mean please? $\endgroup$ – ThisIsMe Mar 8 '15 at 23:09
  • $\begingroup$ If that is the equation for the strong force for quarkonium, is there one for the weak force as well? $\endgroup$ – ThisIsMe Mar 8 '15 at 23:13
  • $\begingroup$ V(r) is the potential of the strong force, k is field energy per unit length, c is the speed of light, and h-bar is Planck's constant over 2pi $\endgroup$ – Jimmy360 Mar 8 '15 at 23:14
  • $\begingroup$ I dont know of an equation for weak force in quarkonium $\endgroup$ – Jimmy360 Mar 8 '15 at 23:21
  • $\begingroup$ The weak force is called weak because its strength is very much smaller than the electromagnetic. In addition the 1/r potential appears in electromagnetism and gravity because the exchanged boson is massless ( photon, graviton) . The weak interaction is mediated with the W and Z which lead to immediate decays for unstable particles and no long range effects as with electromagnetism and gravity. Only at unification energies and higher one could talk of a single form for the unified electroweak force. ( I assume 1/r potential but may be wrong) $\endgroup$ – anna v Jun 18 '15 at 3:08

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.