How are forces related to changes in the motion of an object?

Forces are fundamental to understanding the motion of objects, as they are the primary agents responsible for causing changes in that motion. When a net force is applied to an object, it can lead to a change in velocity, which is defined as acceleration or deceleration depending on the direction of that change.

According to Newton's second law of motion, force is equal to mass multiplied by acceleration (F = ma). This relationship clearly illustrates how the application of a net force results in a change in the state of motion of an object. If an object is stationary and a force is exerted, it will start to move, signifying acceleration. Conversely, if an object is already in motion, a force acting against its direction will decrease its velocity, leading to deceleration.

In essence, without forces acting on an object, there can be no change in its velocity, confirming that forces are intrinsically linked to motion. This principle encapsulates the fundamental concept of dynamics in mechanics, establishing that forces are essential for initiating and modifying the motion of both moving and stationary objects.