Physics

Weight (poundals) = 32.1752 (ft/s^2) * Mass (pounds)

Work = Force * Distance

Newton's law of gravitation

<math>F = \frac{GmM}{r^2}</math>

G: a constant (6.67408 × 10-11 m^3 kg^-1 s^-2 or 1.068846 x 10-9 ft3 lb-1 s-2 (is this the latest?) )

m, M: masses of two objects

r: distance between point-particles