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Learning OutcomesLearning Outcomes

Physical quantitiesPhysical quantities UnitsUnits PrefixesPrefixes Conclusion/ Homework/ Conclusion/ Homework/

RemindersReminders

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Physical QuantitiesPhysical Quantities

A physical quantity is a property that A physical quantity is a property that can be measured or calculatedcan be measured or calculatedThere are many quantities that can be There are many quantities that can be measured or calculated, for example,measured or calculated, for example,SpeedSpeedDistanceDistanceTimeTimeetcetc

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UnitsUnits

The giant marched ten stronts before The giant marched ten stronts before stopping to breakfast on eighty plons stopping to breakfast on eighty plons of porridge and forty-five glups of of porridge and forty-five glups of blackberry wineblackberry wine

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SI UnitsSI Units There is an agreed standardised system of There is an agreed standardised system of

units called SI units, from the French units called SI units, from the French name “Systeme International”name “Systeme International”

This means all physicists use the same This means all physicists use the same units, for example distance is measured in units, for example distance is measured in metresmetres

Units are written down using standard Units are written down using standard symbolssymbols

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Surprisingly, a set of only seven Surprisingly, a set of only seven fundamental (Basic) SI units are fundamental (Basic) SI units are neededneeded

Do you know what are they ?Do you know what are they ?

Other quantities have DERIVED SI Other quantities have DERIVED SI units, for example, speed has a unit units, for example, speed has a unit metre per secondmetre per second

P:\KR\PHYSICS\L2 PHY\AS 2.4 Mechanics\Resources\Physical Quantities, Units,Prefixes.doc

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Conclusion /Homework/ReminderConclusion /Homework/Reminder

Complete the work sheetComplete the work sheet

study guide – pstudy guide – p

workbook - pworkbook - p