The equation that describes the relationship among quantities of force, mass, and acceleration is Newton's Second Law of Motion:

F = m * a

Where:

* F represents force (measured in Newtons, N)

* m represents mass (measured in kilograms, kg)

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

This equation states that the force acting on an object is directly proportional to its mass and acceleration. In other words:

* A larger mass will require a larger force to achieve the same acceleration.

* A larger acceleration requires a larger force for the same mass.