MOTION:
A body is said to be in motion if it changes it's position with respect to it's surrounding.
REST:
A body is said to be in rest if it does not changes it's position with respect to it's surrounding.
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Motion is the change in position of an object with respect to a reference point. Rest occurs when an object is not changing its position relative to a reference point and remains stationary.
If the pen is not moving, it is at rest. If the pen is in motion, then it is not at rest.
Motion and rest are relative concepts in physics, meaning that an object can be in motion or at rest depending on the frame of reference. For example, a person seated in a moving train is at rest relative to the train but in motion relative to an observer outside the train. This demonstrates how motion and rest are interconnected depending on the chosen point of view.
It is unclear from your question whether the pen is at rest or in motion as no context or details are provided. If the pen is not moving, then it is at rest. If the pen is moving, then it is in motion.
Inertia is the tendency of an object to resist changes in its state of motion. An object at rest will stay at rest, and an object in motion will stay in motion, unless acted upon by an external force. This principle is described by Newton's First Law of Motion.
Yes, motion and rest are relative terms because an object can be considered in motion or at rest depending on the observer's frame of reference. An object at rest in one frame of reference may appear to be in motion in another frame of reference.