User:Lh.779/Sand!

This is my sandbox.

$$ \begin{align} F &= G \frac{m_1 m_2}{r^2} \\ &= \frac{G m_1} {r} m_2 \\ \end{align} $$ $$ \begin{array} {lcl} let\ k\ be\ \frac{G m_1} {r} m_2\\ F = k m_2\\ \therefore F \propto m_2 \\ \end{array} $$ $$ \begin{array} {lcl} F = \frac {G m_1 m_2}{r^2} \\ let\ k\ be\ G m_1 m_2 \\ F = \frac {k} {r^2} \\ \therefore F \propto \frac {1} {r^2} \\ \end{array} $$