You have raised an interesting point regarding the movement of objects relative to their size and the limit imposed by the speed of light. While it is true that objects can move significant distances relative to their size (e.g., atoms vibrating or electrons orbiting within an atom), there is a fundamental distinction between the movement of objects at the macroscopic level (e.g., everyday objects) and the limitations imposed by the speed of light.
At the macroscopic level, objects we encounter in everyday life are governed by classical mechanics, which encompasses Newton's laws of motion. According to classical mechanics, objects can move and change their position relative to a reference point. The speed of such movement is determined by the forces acting upon the object and its mass. In this context, the speed of light does not directly limit the movement of macroscopic objects.
On the other hand, the speed of light does play a crucial role in the realm of relativity, particularly in Einstein's theory of special relativity. According to this theory, the speed of light in a vacuum is the maximum speed at which information or signals can travel. Special relativity introduces concepts such as time dilation and length contraction that apply to objects traveling at speeds approaching the speed of light.
When objects approach the speed of light, their behavior becomes subject to relativistic effects, such as time dilation, where time slows down for the moving object relative to a stationary observer, and length contraction, where the object's length appears shorter in the direction of its motion. These effects become more pronounced as an object's speed approaches the speed of light, making it increasingly difficult for massive objects to achieve or exceed light speed.
In essence, while objects at the macroscopic scale can move relative to their size, the speed of light places a fundamental limit on the speed at which information and signals can propagate. The behavior of massive objects approaching light speed is governed by the principles of relativity, where relativistic effects become significant and prevent the objects from surpassing or even reaching the speed of light.
It's worth noting that these concepts can be complex and are thoroughly studied within the field of physics. While this explanation provides a simplified overview, the complete understanding of these phenomena requires a more comprehensive exploration of relativity and its mathematical framework.