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Question
Hello sir

Sir why anything which changes its position with respect to its immidiate surroundings is called motion.

Sir i asked this smae question to my teacher, she told it is just defination, then in reality,if any object changes its position with respect to its surroundings is not called the person or object is in motion.

Answer
Hello Aishwarya,

Motion is the word we use to describe how a person or object managed to change its position with respect to its immediate surroundings. So I guess I also am saying that it is just a definition.

I think I disagree with your last sentence. Perhaps I don't understand this part of it:
"in reality,if any object changes its position with respect to its surroundings is NOT (caps mine) called the person or object is in motion".
It seems that you are saying the object is not, or was not, in motion. Because I would say it IS, or was, in motion if the object changes its position with respect to its surroundings.

I hope this helps,
Steve  

Physics

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Steve Johnson

Expertise

I would be delighted to help with questions up through the first year of college Physics. Particularly Electricity, Electronics and Newtonian Mechanics (motion, acceleration etc.). I decline questions on relativity and Atomic Physics. I also could discuss the Space Shuttle and space flight in general.

Experience

I have a BS in Physics and an MS in Electrical Engineering. I am retired now. My professional career was in Electrical Engineering with considerable time spent working with accelerometers, gyroscopes and flight dynamics (Physics related topics) while working on the Space Shuttle. I gave formal classroom lessons to technical co-workers periodically over a several year period.

Education/Credentials
BS Physics, North Dakota State University
MS Electrical Engineering, North Dakota State University

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