Physics - Motion - Class - 7 - Selina Solution - ICSE.

Explain the meaning of the terms rest and motion.

Rest - a body is said to be at rest if it does not change its position with respect to its immediate surroundings.
Motion - a body is said to be in motion if it changes its position with respect to its immediate surrounding.

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Physics - Motion - Class - 7 - Selina Solution - ICSE.

 Fill in the blanks using one of the words: at rest, in motion. (a) a person walking in a compartment of a stationary train is  in motion (person)  relative to the compartment and is  in motion (person)  relative to the platform. (b) a person sitting in a compartment of a moving train is  in rest  relative to the other person sitting by his side and is.  In motion  relative to the platform.
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