When a net force is applied to an object, it causes the object to accelerate. The acceleration produced is directly proportional to the net force applied and inversely proportional to the mass of the object. This relationship is described by Newton's second law of motion:

F = ma

Where:

- F is the net force applied to the object (measured in Newtons, N)

- m is the mass of the object (measured in kilograms, kg)

- a is the acceleration produced by the force (measured in meters per second squared, m/s²)

According to Newton's second law, the effect of a force on motion depends on two factors:

- Magnitude of the Force: The greater the net force applied to an object, the greater the acceleration it will produce. For example, if you push a book with a small force, it will accelerate less than if you push it with a strong force.

- Mass of the Object: The more massive an object is, the less acceleration it will experience for a given amount of force. This is because mass is a measure of an object's resistance to changes in its motion. For instance, it is easier to accelerate a small car than a large truck because the car has less mass.

In summary, the effect of a force on motion is to cause acceleration. The magnitude of acceleration depends on both the strength of the force and the mass of the object being acted upon.