Question

In which of the following case(s) can we say that the object is moving?

• A. The observer has to change his head position with time to see the object
• B. The object appears to move towards the observer
• C. The object appears to move away from the observer
• D. The object does not change position with respect to the observer

Answer 1

Answer: (A), (B), (C)

The correct options are
A

The observer has to change his head position with time to see the object

B

The object appears to move towards the observer

C

The object appears to move away from the observer

An object is said to be in motion when it changes its position with respect to the observer. The position of the object changes with respect to him when he has to change his head position or when the object appears to come closer or move away from the observer.

For example, a book that is at rest, relative to the table it lies on, is moving at about 30 kilometers per second relative to the sun. The book moves even faster relative to the center of our galaxy.