Written by Jerry Ratzlaff on . Posted in Classical Mechanics


When you think of weight ( \(WT\) ) it is probably associated with mass. But weight is not mass. Weight is a force on an object accelerated by gravity.  Weight is a vector quantity having magnitude and direction, some of these include acceleration, displacement, drag, force, lift, momentum, thrust, torque, and velocity .

Weight formula

\(W = mg \;\)


\(W\) = weight

\(m\) = mass

\(g\) = gravitational acceleration

Solve for:

\( m = \frac {W} {g} \)

\( g = \frac {W} {m} \)

Specific Weight

Specific weight is the weight per unit volume of a substance.

Specific Weight formula

\(\gamma = \rho g\)


\(\gamma\) (Greek symbol gamma) = specific weight

\(\rho\) (Greek symbol rho) = density

\(g\) = gravitational acceleration


Tags: Equations for Weight