Friday, 06 November 2015 1.1.1 The Unit Learning Objectives: Recall the base units Differentiate between base and derived units Use unit prefixes correctly.

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Friday, 06 November The Unit Learning Objectives: Recall the base units Differentiate between base and derived units Use unit prefixes correctly Estimate physical quantities

SI Units SI Units are the international standard system of measurement. A measurement will consist of a Quantity (number) and a Unit. E.g. – 100 kg 12.5 m/s K

QuantityUnitAbbreviation Mass Length Time Temperature Electrical current Amount of substance Luminous Intensity

QuantityUnitAbbreviation Mass kilogramkg Length metrem Time seconds Temperature kelvinK Electrical current ampereA Amount of substance molemol Luminous Intensity candelacd

Derived Units All other measured quantities have units that are derived from these base units Example – unit of speed = distance/time = m/s Example – unit of acceleration = in velocity time = m/s = m/s 2 s

PrefixNameAbbreviation X X10 -9 X10 -6 X10 -3 X10 -2 X10 3 X10 6 X10 9 X10 12

PrefixNameAbbreviation X picop X10 -9 nanon X10 -6 micro μ X10 -3 millim X10 -2 centic X10 3 kilok X10 6 MegaM X10 9 GigaG X10 12 TerraT

Estimation When working in physics it is important to think about the answers we find. Does the answer make sense? Is it reasonable. To do this we need to be able to estimate what would be a reasonable answer. So if we are calculating the mass an elevator can lift safely and we get an answer of 1500 kg does that seem reasonable?

Try These Mass of Sun (Earth = 6 x kg) Mass of a silver 54 plate Mondeo estate Length of this science lab Height of house Litres in a bath Power of human Power of horse Power of power station