What is a motion?

Question

What is a motion?

BlackTom AI · Accepted Answer

To understand what a motion is, we should examine what each option implies about the state of an object.
Option a: 'Continual change in object’s position' This aligns with the standard definition of motion in physics: an object is in motion if its position changes with respect to a reference frame over time. The word 'continual' emphasizes that the position is not constant, which is central to motion.
Option b: 'Continual change in object’s acceleration' This describes a situation where the rate at which velocity changes is itself changing. While this is a dynamic condition related to motion, it does not define motion itself. An object could be in motion with constant acceleration or with changing acceleration; the key notion of motion is position change, not how acceleration evolves.
Option c: 'Continual change in object’s time' Time itself does not change for an object; rather, an object's state changes with time. Saying there is a continual change in time is scientifically inaccurate because time is a parameter, not a property of the object that changes.
Option d: 'Continual change in object’s speed' Speed can vary while the object still is in motion, but motion is not defined by changes in speed alone. An object moving at constant speed and changing direction is still in motion, so speed alone is not a complete definition of motion.
In summary, the core concept of motion is the changing position of an object relative to a reference point. The other options describe related dynamics (acceleration, time, or speed changes) but do not capture the essential definition of motion by themselves.

UCIC 202503 PHYS101 Quiz 1

What is a motion?

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