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<p>and others). An example of a covariant equation is the <a href="page.php?w=Lorentz_force">Lorentz force</a> equation of motion of a charged particle in an electromagnetic field (a generalization of Newton's second law)</p>

<p>where  and  are the mass and charge of the particle (invariant scalars);  is the <a href="page.php?w=invariant_interval">invariant interval</a> (scalar);  is the <a href="page.php?w=4-velocity">4-velocity</a> (4-vector); and  is the <a href="page.php?w=electromagnetic_tensor">electromagnetic field strength tensor</a> (4-tensor).</p><p>
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