$U = m \phi$

$F_{g} = \, – \frac{dU}{dr}$

$g = \, – \frac{d \phi}{dr}$

$\frac{d \phi}{dr}$ is known as potential gradient.

Gravitational field strength points in direction of decreasing $\phi$.

$U = m \phi$

$F_{g} = \, – \frac{dU}{dr}$

$g = \, – \frac{d \phi}{dr}$

$\frac{d \phi}{dr}$ is known as potential gradient.

Gravitational field strength points in direction of decreasing $\phi$.

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