For this, we develop the concepts of. We saw that uniform motion needs the concept of velocity. In physics, we need to define the notions of heat, temperature, work, etc.
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Historically, it took a long time to arrive at the proper concept of ‘heat’.
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9.2 pressure a sharp needle when pressed against our skin pierces it. In physics, however, the word ‘work’ covers a definite and precise meaning. Motion is change in position of an object with time. In this chapter, we shall learn how to describe motion.
How does the position change with time ? A large class of problems with extended bodies can be solved by considering them to be rigid bodies. 1.1 introduction measurement of any physical quantity involves comparison with a certain basic, arbitrarily chosen, internationally accepted reference standard called unit. Ideally a rigid body is a body with a perfectly definite and unchanging shape.
Our skin, however, remains intact when a blunt object with a wider contact area (say the back of a spoon) is.
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