The equation that relates force (F), mass (m), and acceleration (a) is Newton's second law of motion, which can be expressed as:
\[ F = m \times a \]
To solve for mass (m), you would rearrange the equation as follows:
\[ m = \frac{F}{a} \]
This formula shows that if you know the force acting on an object and its acceleration, you can calculate the mass by dividing the force by the acceleration.