* As mass increases, acceleration decreases.

* As mass decreases, acceleration increases.

This relationship is described by Newton's Second Law of Motion:

F = m * a

Where:

* F is the force

* m is the mass

* a is the acceleration

If force is constant, we can rearrange the equation to show the inverse relationship:

a = F / m

This equation tells us that acceleration is directly proportional to the force and inversely proportional to the mass.

Here's a simple example:

Imagine you push a small car (low mass) and a large truck (high mass) with the same force. The small car will accelerate much faster than the large truck because its mass is lower.

In essence, the more massive an object is, the harder it is to accelerate, even with the same force applied.