Unit SystemsFUNDAMENTAL DIMENSIONSRev. 0Page 1CP-01FUNDAMENTAL DIMENSIONSLength, mass, and time are the three fundamental dimensions on which themeasurement of all physical quantities is dependent.EO 1.1 DEFINE the three fundamental dimensions: length,mass, and time.EO 1.2 LIST standard units of the fundamental dimensions foreach of the following systems:a. International System of Units (SI)b. English SystemEO 1.3 DIFFERENTIATE between fundamental and derivedmeasurements.FundamentalDimensionsPhysics is a science based upon exact measurement of physical quantities that are dependent uponthree fundamental dimensions. The three fundamental or primary dimensions are mass, length, andtime. These three fundamental units must be understood in order to lay the foundation for themany concepts and principles presented in this material.MassMass is the amount of material present in an object. This measurement describes "howmuch" material makes up an object. Often, mass and weight are confused as being thesame because the units used to describe them are similar. Weight (a derived unit, nota fundamental unit) is a measurement that describes the force of gravity on the "mass"of an object.LengthLength is the distance between two points. The concept of length is needed to locatethe position of a point in space and thereby describe the size of a physical object orsystem. When measuring a length of pipe, the ends of the pipe are the two points andthe distance between the two points is the length. A typical unit used to describelength is the "foot."
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