Lesson 3 Physical Quantities,Units, Prefixes

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Lesson 3 Physical Quantities,Units, Prefixes

  1. 1. Learning Outcomes <ul><ul><ul><ul><li>Physical quantities </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Units </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Prefixes </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Conclusion/ Homework/ Reminders </li></ul></ul></ul></ul>
  2. 2. Physical Quantities <ul><li>A physical quantity is a property that can be measured or calculated </li></ul><ul><li>There are many quantities that can be measured or calculated, for example, </li></ul><ul><li>Speed </li></ul><ul><li>Distance </li></ul><ul><li>Time </li></ul><ul><li>etc </li></ul>
  3. 3. Units <ul><li>The giant marched ten stronts before stopping to breakfast on eighty plons of porridge and forty-five glups of blackberry wine </li></ul>
  4. 4. SI Units <ul><li>There is an agreed standardised system of units called SI units, from the French name “Systeme International” </li></ul><ul><li>This means all physicists use the same units, for example distance is measured in metres </li></ul><ul><li>Units are written down using standard symbols </li></ul>
  5. 5. Surprisingly, a set of only seven fundamental (Basic) SI units are needed Do you know what are they ? Other quantities have DERIVED SI units, for example, speed has a unit metre per second P:KRPHYSICSL2 PHYAS 2.4 MechanicsResourcesPhysical Quantities, Units,Prefixes.doc
  6. 6. Conclusion /Homework/Reminder Complete the work sheet study guide – p workbook - p

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