The exertion of a force on an object that produces motion in the direction of the force is called acceleration.

Here's why:

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

* Acceleration: Acceleration is the rate at which an object's velocity changes. This change can be in speed, direction, or both.

When a force acts on an object, it causes the object to accelerate in the direction of the force. This means the object's velocity will change in that direction.

Key Concepts:

* 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: F = ma (Force = mass x acceleration).

* Net Force: The net force is the sum of all forces acting on an object. If the net force is not zero, the object will accelerate.