The relationship between acceleration (a), mass (m), and force (F) is expressed by Newton's Second Law of Motion:

F = m * a

This equation states that:

* Force (F) is directly proportional to mass (m). This means that a larger mass requires a larger force to achieve the same acceleration.

* Force (F) is directly proportional to acceleration (a). This means that a greater force will result in a greater acceleration for a given mass.

You can also rearrange this equation to solve for acceleration or mass:

* a = F / m (acceleration is equal to force divided by mass)

* m = F / a (mass is equal to force divided by acceleration)