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From this Chapter, we start learning about Physics. Chemistry deals with the properties of different kinds of substances. Biology deals with the properties of living organisms. Physics, on the other hand, deals with the behaviour of everything in Nature.

Most things in Nature are always moving. Even if you think that you are just sitting on a chair, the chair is on the Earth, which is revolving around the Sun at about 1 lakh kilometres per hour! The Sun, along with the planets themselves, are going around the Milky Way galaxy at speeds of about 8.3 lakh kilometres per hour! Let us now understand the different concepts involved when an object is in motion.