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Derived Quantities in Physics
Derived quantities are physical quantities that are obtained by combining two or more fundamental quantities using mathematical relationships.
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Derived quantities in physics.
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Definition. Derived quantities are
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physical quantities that are obtained by
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combining two or more fundamental
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quantities using mathematical
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relationships. Derived quantities depend
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on fundamental quantities such as
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length, mass, and time. They are not
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measured directly. Instead, they are
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calculated using formulas. For example,
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speed is obtained by dividing distance
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by time. both of which are fundamental
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quantities. Imagine baking a cake.
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Flour, sugar and eggs are your basic
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ingredients. Fundamental quantities. The
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cake you produce by mixing them in the
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right way is like a derived quantity
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created from the basics. Derived
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quantities are quantities formed by
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combining basic measurements. Derived
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quantities are defined using formulas
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made from fundamental quantities.
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Examples: Speed equals distance/ time.
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Density equals mass. Volume. Force
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equals mass time acceleration. Key
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points. Derived quantities depend on
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fundamental quantities. They're
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calculated not measured directly. Each
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has a derived SI unit. They describe
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more complex physical phenomena. They
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are widely used in physics calculations.
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Common derived quantities and their SI
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units. Speed MSY, velocity MSY,
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Acceleration MS 2, Force Newton on
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Density KGM cubed, Pressure Pascal P,
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Energy, Jewel J. Examples: Speed of a
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moving car, density of a metal block,
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Force applied to push an object,
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pressure in a gas cylinder, energy used
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by an electric appliance. Applications:
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Motion analysis in transportation,
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engineering and construction design,
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electrical and mechanical systems,
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scientific and laboratory calculations,
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industrial process control. Question,
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how are derived quantities different
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from fundamental quantities? Answer:
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Derived quantities are obtained by
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combining fundamental quantities
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mathematically while fundamental
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quantities are independent and measured
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directly. Solved problem question. A car
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travels a distance of 100 m in 5S.
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Calculate its speed. Answer given.
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Distance equals 100 m. Time equals 5s.
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Speed equals distance/ time. Speed
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equals 100s. Speed equals 20 msy.
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