This document discusses physical quantities, units, and SI prefixes. It explains that physical quantities can be measured, and lists some common examples like speed and distance. Standard SI units provide agreed upon units that all physicists use, such as measuring distance in meters. The seven basic SI units are identified for fundamental quantities, while other derived units exist like meters per second for speed. Students are assigned a worksheet and study guide for homework.

1. Learning Outcomes Physical quantities Units Prefixes Conclusion/ Homework/ Reminders

2. Physical Quantities A physical quantity is a property that can be measured or calculated There are many quantities that can be measured or calculated, for example, Speed Distance Time etc

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

4. SI Units There is an agreed standardised system of units called SI units, from the French name “Systeme International” This means all physicists use the same units, for example distance is measured in metres Units are written down using standard symbols

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

6. Conclusion /Homework/Reminder Complete the work sheet study guide – p workbook - p