# Physics equation manipulation question!?

How would the formula "Fg=(GMm/r^2)" be written so there is a ratio between Fg and r?

Having some trouble with my homework. Thanks for your time.

### 3 Answers

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- RealProLv 75 months agoFavorite Answer
Fg / r = GMm/r^3

Which is not particularly useful if you ask me, are you sure that's what you mean?

- 5 months ago
Fg = G*M*m/r^2

here r is the distance between the centers of the two bodies of masses M,m

divide with r on both sides

Fg/r = G*M*m/(r^2*r)

Fg/r = G*M*m/r^3

- Steve4PhysicsLv 75 months ago
Fg = GMm/r²

Fg/r = GMm/r³

You can't get the ratio Fg/r without having the r³ term.

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