That's correct! You've stumbled upon a fundamental concept in physics called Newton's Second Law of Motion.

Here's the breakdown:

* Newton's Second Law: This law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This means:

* More force = more acceleration

* More mass = less acceleration

* Why does this happen? Think of it like pushing a shopping cart. If you push an empty cart, it accelerates quickly. But if you fill the cart with heavy groceries, it takes more effort to get it moving, and it accelerates much slower.

The Equation:

This relationship is summarized by the following equation:

* 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

In Conclusion:

Increasing the mass of an object while keeping the force constant will indeed decrease its acceleration.