According to Newton's laws, what describes the motion of an object?

Newton's laws describe the behavior of objects in motion and provide insight into how forces influence that motion. Specifically, the third law states that an object will maintain its state of rest or uniform motion in a straight line unless acted upon by an external force. This principle underscores the relationship between motion and the forces that act on an object.

When we choose the option indicating that the motion of an object is affected by forces acting on it, it encapsulates the idea that any change in motion—be it speed, direction, or stopping—is a direct result of applied forces. Hence, the motion of an object cannot be fully understood in isolation but rather must be analyzed in the context of these external influences.

The other options do not accurately convey this fundamental principle of motion as explained by Newtonian mechanics. For example, stating that motion changes uniformly with time may simplify some cases like constant acceleration, but it does not encompass all types of motion in relation to force. Similarly, the idea that an object will continue unless acted upon by resistance lacks the essential acknowledgment of all forces, not just resistance. Lastly, the notion that all objects behave the same regardless of mass is misleading, as mass significantly influences how objects respond to the same force, affecting acceleration according to Newton