The equation that relates force, mass, and acceleration is Newton's Second Law of Motion:

F = m * a

Where:

* F is the force (measured in Newtons, N)

* m is the mass (measured in kilograms, kg)

* a is the acceleration (measured in meters per second squared, m/s²)

This equation tells us that the force acting on an object is directly proportional to the object's mass and its acceleration.