How does linear motion differ from angular motion?

Linear motion refers to movement along a straight path, where an object moves from one point to another without changing direction. It is characterized by its displacement, speed, and velocity, with all points in the body moving the same distance in a given time. In contrast, angular motion involves an object rotating around a fixed axis, where different points of the object may have varying distances and speeds from the axis of rotation. For example, a spinning wheel exhibits angular motion, as different points on the rim travel different distances in the same amount of time.

Understanding this distinction is fundamental in biomechanics, particularly when analyzing human movement. For instance, when a gymnast performs a somersault, their body moves in an angular motion around their center of mass, while transitioning into a run involves linear motion along the ground. The distinction emphasizes how various physical principles apply to different types of motion, influencing factors such as speed, force application, and energy expenditure in human movements.