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Chapter 1 Units and Vectors: Tools for Physics

Chapter 1 Units and Vectors: Tools for The Important The SI SystemPhysics is based on measurement. Measurements are made by comparisons to well definedstandardswhich define theunitsfor our system(popularly known as themetric system) is the one used in Physics . Itsunit of length is the meter, its unit of time is the second and its unit of mass is the quantities in Physics are derived from these. For example the unit of energy is thejoule, defined by 1 J = 1kg a convenience in using the SI system we can associate prefixes with the basic Units torepresent powers of 10.

represent it in polar form. If A is a two–dimensional vector and θ as the angle that A makes with the +x axis measured counter-clockwise then we can express this vector in terms of components Ax and Ay or in terms of its magnitude A and the angle θ. These descriptions are related by: Ax = Acosθ Ay = Asinθ (1.5) A = q A2 x +A2 y tanθ = Ay ...

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