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Motion in Straight Line
Question
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Explain by giving an example that rest and motion are the relative terms i.e. a body can be simultaneously at rest as well as in motion.

Answer

Rest and motion are relative terms. A body can be simultaneously at rest as well as in motion.

Let two persons A and B be sitting in a moving train and a third person be at the platform. Here the position of A does not change with respect to B. Therefore, A is at rest as per B. But, position of A changes with respect to C with time. Hence A is in motion with respect to C.

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Some More Questions From Motion in Straight Line Chapter

When an object in motion can be considered as particle or point object?

Can you think of physical phenomena involving the moon in which moon cannot be treated as particle?

A train is crossing the bridge. Can it be taken as a particle?

Can a train be taken a particle? Give an example in support of your answer.

 A particle is moving along curved line in space. Is the motion one dimensional?

State which of the following are examples of one, two or three dimensional motion: 

(a) A kite flying in the sky.

(b) The earth revolving around the sun. 

(c) A train moving along the equator of the earth in clockwise direction. 

(d) Accelerated motion of a particle in a straight line.

Define distance.

Define displacement.

Can magnitude of displacement be greater than distance travelled by particle?