Question

What do we say when a body remains in one position for a long time?
A) Motion
B) Rest
C) Stationary
D) None of the above

Answer 1

A body is said to be in motion when the position of the body changes with time. However, there can also be cases when the body remains in the same position for a long duration of time. The position of a body gets changed due to external forces and stimuli acting on it.

Complete step by step answer:
When external forces act on a body, they have a number of effects on the body. One of these effects is that they try to bring about a change in the position of the body with time.
However, it can also be the case that the body continues to remain in the same position for a long duration of time. In this case, the body is said to be at rest.
Therefore, the correct answer is B) Rest.

Note: Students must also note the fact that whether a body is at rest or not, also depends upon the frame of reference of the observer. For example, if the observer is in a frame of reference that is moving along with the body, then in that frame of reference, it appears to the observer that the body is not in motion, but at rest. Hence, students must also correctly determine in which frame of reference the question is being solved. If no other frame of reference is stated it is assumed that the frame of reference is the inertial frame of reference, that is, the frame of reference attached with the ground.