Unformatted text preview: is. A Rigid Body does not change shape when a load is applied A Concentrated Force represents the effect of a loading that can be assumed to act at a point on the body. Weight is a measure of the force of attraction between a body and the earth. It is not an absolute quantity and varies with location. W = mg. 1.3 Units of Measurement SI Units – The International System of Units is a mass
based system. Therefore the mass of an object is normally given. If the weight of the object is required, the mass must be multiplied by gravity (9.81 m/s2). •
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• length – meters, m time – second, s mass – kilograms, kg force – Newton, kgm/s2 US Customary Units – This system of units is a force
based system. Therefore objects are represented in terms of weight and no adjustment is required. • length – feet, ft • time – second, s • mass – slug, lbs2/ft • force – pound, lb 1.5 Numerical Calculations In statics we will generally round off the answers to three significant figures since most of the data in engineering mechanics is reliable to this accuracy....
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 Fall '08
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