Question

The process of change in position of an object over time is called:
A. Rest
B. Stationary
C. Motion
D. None of the above

Answer 1

Hint: This is actually a very basic question related to kinematics. You could simply recall the definitions of the terms given in the options. Then cross check which of them matches the one given in the question. After finding the answer also include a brief description on the same.

Complete solution:
Any body that changes its position over time is said to be in motion. It can be mathematically described by using speed, velocity, distance covered, displacement, acceleration and time.
Frame of reference is a very important concept when we describe the motion of an object. Kinematics is the branch of physics that describes the motion of a body without referring to its cause and dynamics deals with forces as well as their effect on motion.
An object is said to be at rest when it is found to be not changing its position relative to a frame of reference given. Stationary is another term that indicates the state of rest.
We could define motion for any physical system, namely, any bodies, objects, radiations, curvature, space-time, etc.
So we could conclude that the process of change in position of an object over time is called motion.

Hence, option C is found to be the correct answer.

Note:
The important point to be taken care of is the frame of reference in which defines the motion of a body. A body that appears in motion to one person may be at rest with respect to another person. As we cannot define an absolute frame of reference, we cannot define an absolute motion for a body. So, we could say that everything in the universe is in motion with respect to something.