Newton's Third Law equal and opposite forces

  • Thread starter protonman
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  • #51
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There is probably a better example of Newton's Third Law being violated by classical particles.

Consider two protons. One is travelling North, the other travelling West. Both travel along the same plane.

At some point their paths will cross. Let us suppose that Proton A reaches the crossing point first. When Proton B reaches the crossing point, it will exert a magnetic force on Proton A. But Proton A will not exert a force on Proton B, because Proton B is positioned along the path Proton A is travellling.

Of course, the problem here is the time delay in which the electromagnetic force propagates. This problem is similar to the whirled string problem, I suppose.
 

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