Here's why:

* Newton's Second Law of Motion: 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. Mathematically, this is expressed as:

* F = ma

* Where:

* F is the net force

* m is the mass of the object

* a is the acceleration

* Constant Force: If the net force acting on an object remains constant, the acceleration will also remain constant.

Example:

Imagine pushing a box across a smooth floor with a constant force. As long as your pushing force remains the same, the box will accelerate at a constant rate.

Important Note: While a constant force produces constant acceleration, the opposite is not always true. A varying force can still produce constant acceleration if the force changes in a way that precisely compensates for the changes in the object's velocity.