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.

* F = ma

* F: Net force (measured in Newtons, N)

* m: Mass of the object (measured in kilograms, kg)

* a: Acceleration of the object (measured in meters per second squared, m/s²)

* Net Force: This is the vector sum of all the forces acting on an object. If the forces are balanced, the net force is zero, and there is no acceleration. If the forces are unbalanced, there is a net force, and the object will accelerate.

In simpler terms:

* Force is a push or pull that can change an object's motion.

* Acceleration is the rate at which an object's velocity changes.

* Net force is the overall effect of all the forces acting on an object.

Therefore, a net force is required to produce acceleration. A larger net force will produce a larger acceleration, and a smaller net force will produce a smaller acceleration.