Physics
Comment on the statement 'rest and motion are relative terms'. Give an example.
Motion in One Dimension
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Answer
An object can be in motion relative to one set of objects while at rest relative to some other set of objects. Thus, rest and motion are relative terms.
Example — If a boy is sitting on a bench in a bus stop and he sees a moving bus, for him the bus is in motion but the trees near by will appear to him at rest.
But a boy who is sitting inside a bus, to him the trees and the boy outside sitting on the bench will appear to move in opposite direction. But the roof of the bus and driver will appear to him at rest.
From the above example it can be concluded that rest and motion are relative terms.
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Related Questions
Write true or false for each statement:
(a) Two trains going in opposite directions with the same speed are at rest relative to each other.
(b) A ball is thrown vertically upwards. Its motion is uniform throughout.
(c) The motion of a train starting from one station and reaching at another station is non-uniform.
(d) A motion which repeats itself after a fixed interval of time is called periodic motion.
(e) A ball thrown by a boy from a roof-top has oscillatory motion.
(f) Mass has both magnitude and direction.
(g) Weight always acts vertically downwards.
(h) Mass varies from place to place but weight does not.
Match the following:
Column A Column B (a) circular motion (i) a running fan (b) periodic motion (ii) a car moving in a market (c) vibratory motion (iii) movement of the hands of a clock (d) rotatory motion (iv) motion of wire of a guitar (e) non-uniform motion (v) motion of pendulum of a clock 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 ………………. relative to the compartment and is ………………. relative to the platform.
(b) A person sitting in a compartment of a moving train is ……………….. relative to the other person sitting by his side and is ………………….. relative to the platform.
Name five different types of motion you know.