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chapter01_CM%20-%20students

# chapter01_CM%20-%20students - Why Study Physics Variables...

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1 •Why Study Physics? •Variables & Abstract Concepts •Mathematics – Physics talks •Scientific Notation and Significant Figures •Units •Dimensional Analysis •Problem Solving Techniques •Approximations •Graphs

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2 1/ Physics is the foundation of every science (astronomy, biology, chemistry…). 2/ Many pieces of technology and/or medical equipment are by-products of physics, A physicist, Tim Berners-Lee has founded the WEB …. as a tool to do physics. 3/ Studying physics allows to develop good thinking skills, problem solving skills, and give you the background needed to increase our understanding of the world around us .
3 The Concept of Time : - t: The time a bus drives between two stations ~ 300 sec (5 minutes) - t: The time it takes for a red light to change to green, ~10 sec - t: The time to cross the street 120 sec(2 minutes) - t: The time it takes for the earth to circle the sun(xxx,xxx,xxx,xxx…. . ………sec) - t: The time it takes to go to work 18000 sec(15 minutes) All those example use the concept of time We will represent time by the letter t The time t is variable , sometimes it is long: 3600 seconds Or more, sometimes short 1/10 of a second. In each case we will use the same letter t, which will represent the same abstract concept : time It will be measured in units of time , for example in seconds , [t] means the dimension of time.

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4 Other Abstract Concepts - A sky-scraper is more massive than a red-stone brick house - A building is more massive than many trucks - A truck is more massive than a car - A car is more massive than a person The more massive is the objects the more difficult it is to make it move, or, to stop it if it moves (it is a measure of Inertia ) We will represent the concept of mass by the letter m m: is the mass of the sky-scraper m: is the mass of the red-stones building m: is the mass of a truck m: is the mass of a car m: is the mass of a person It will be measured in mass units, for example the kg [M] means the dimension of mass
5 Mathematical Relations - Once we have defined concepts , we can define mathematical relations between them. - Physics uses mathematical relations between those general concepts. Remark: The general mathematical relations will hold no matter if it is the mass of a pen or the mass of a building we are dealing with, the time it takes to go home or the time it takes the earth to make a complete revolution around the sun. - Physics uses Mathematical relations between general concepts

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6 The Use of Mathematics Mathematics is the language of physics. It expresses physical concepts in their most exact, concise and refined form. The form which suits the investigation.
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chapter01_CM%20-%20students - Why Study Physics Variables...

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