Newton's Law of Universal Gravitation/Also presented as

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Newton's Law of Universal Gravitation: Also presented as

Newton's Law of Universal Gravitation can also be presented in the form:

$\mathbf F_{a b} \propto \dfrac {m_a m_b \hat {\mathbf r}_{b a} } {r^2}$

where $\hat {\mathbf r}_{a b}$ is the unit vector in the direction from $b$ to $a$.


Some presentations do not consider the vector aspects, merely expressing the relationship in terms of scalars:

$F = \dfrac {k m_a m_b} {r^2}$

where the constant is variously specified.


Sources

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