Circular orbit
= Circular orbit
A circular orbit maintains constant distance from its centre of attraction. Its inward radial acceleration has magnitude $v^2/r$, so the radial force must satisfy $F_r=-mv^2/r$.
= Circular orbit
A circular orbit maintains constant distance from its centre of attraction. Its inward radial acceleration has magnitude $v^2/r$, so the radial force must satisfy $F_r=-mv^2/r$.