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SI Units - The Systme The me International International...

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The Syst The Syst ème ème International International SI Units SI Units GEL2006
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Base Quantity Base Unit Name Symbol Name Symbol Time Length Mass Temperature Electric Current Amount of Substance Luminous Intensity t l m T , Ө I n (not in A Level) second metre kilogram kelvin ampere mole candela s m kg K A mol cd
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Physical Quantity Defined as : Unit Special Name velocity acceleration density momentum force pressure work (energy) power electrical charge potential difference resistance
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Homogenous Equations • E p = m g h • = • Nm = kg kgms -2 kg -1 m • kgms -2 m = kgm 2 s -2 • kgm 2 s -2 = kgm 2 s -2 2200 ∴ This equation is homogenous J kg Nkg -1 m
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Homogenous Equations • v 2 = u 2 +2ax • = + • m 2 s -2 = m 2 s -2 + m 2 s -2 2200 ∴ This equation is homogenous m 2 s -2 m 2 s -2 ms -2 m
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Homogenous Equations • F = mv r • = • kgms -2 = kgs -1 2200 ∴ This equation is not homogenous N kg ms -1 m -1
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Homogenous Equations • What is missing? kgms -2 = kgs -1 2200 ∴ The equation should read:
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