ENGR 1166 Lecture Notes - Lecture 1: Ampere, Kilogram, Junkers J 1
19 Apr 2017
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Dimensions - the measurement of something in physical space. Number of dimensions = number of physical properties. Force (m*g = m * = ) Cgs (centimeters, grams, seconds) (length, mass, time) Unit foot slug second pound psi force * length. Symbol ft = 12 in slug s lb or (psi) lb * ft. A measured quantity has a numerical value and unit. You can add or subtract quantities only when they are the same unit. 3cm - 1mm you need to convert at least one quantity 30mm - 1mm = 29mm. 3cm - 1sec = not a thing . Numerical units and their corresponding units can be combined by multiplication or division. Torque = moment = couple = force * length = newton * m = nm. Pressure = stress = = = = = 13 psi. 30 gpa 30 x mpa (30 x = 30 x x )
