Here's why:

* Force: A force is an interaction that can cause a change in an object's motion (acceleration). It has both magnitude and direction.

* Mass: Mass is a fundamental property of matter that represents its resistance to acceleration. It is a scalar quantity, meaning it only has magnitude.

Think of it like this:

* Force is the push or pull. Imagine pushing a heavy box. The force you apply is what moves the box.

* Mass is the weight of the box. The heavier the box, the harder it is to push (more mass means more resistance to acceleration).

The relationship between mass and force is described by Newton's Second Law of Motion:

Force (F) = Mass (m) * Acceleration (a)

So, while mass is not a force itself, it directly influences the effect of forces on objects.