Physics II workshop_Part_1

Physics II workshop_Part_1 - Units and Dimensions In...

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4 Units and Dimensions In physics we measure quantities such the length of a room or the mass of an electron. The measurement results in a “ physical quantity ” consisting of a pure number and a unit. Physicists also discuss dimensions of physical quantities. The System International (SI) is based on 4 fundamental dimensions, length, L, time, T, mass, M, and charge Q. All quantities in this course are combinations of the first three "dimensions." Each of these dimensions must be measured in some type of unit. The base units that we will use are the SI units, sometimes called mks. Other systems of units are the cgs and US Engineering. They are defined in the text. Quantity Dimension SI Unit cgs US Engineering (1) US Engineering (2) Length L meter, m centimeter, cm foot. ft meter Mass M kilogram, kg gram, g slug kg-mass, kgm Time T second, s second, s second, s second, s The base units and dimensions are used to find units of derived quantities. Some of the unit combinations have their own names. Quantity
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Physics II workshop_Part_1 - Units and Dimensions In...

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