The mass of an object and its acceleration are inversely proportional, meaning that as one increases, the other decreases, and vice versa. This relationship is described by Newton's Second Law of Motion:

F = m * a

where:

* F is the net force acting on the object

* m is the mass of the object

* a is the acceleration of the object

Here's how it works:

* Greater Mass, Less Acceleration: If you apply the same force to two objects with different masses, the object with greater mass will accelerate less. This is because it requires more force to move a heavier object at the same rate.

* Smaller Mass, Greater Acceleration: Conversely, if you apply the same force to two objects with different masses, the object with smaller mass will accelerate more. This is because it requires less force to move a lighter object at the same rate.

Example: Imagine pushing a car and a bicycle with the same force. The bicycle, being lighter, will accelerate much faster than the car.

In essence, mass is a measure of an object's inertia - its resistance to changes in motion. The greater the mass, the greater the inertia, and the harder it is to accelerate.