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# Y11 atoms 3 (UNITS)

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### Transcript

• 1. If a sprinter runs 100m in 10 seconds what is his speed? If a motor scooterist travels 8km in 15 minutes what is her speed? How did you do? Feeling Good? Who was fastest?
• 2. Term 1 – Atoms and Matter Atoms – Lesson 2
• 3. Measurement as Entertainment
• 4. Learning Intentions.. To understand that scientists must use  units precisely and accurately in their measurements and calculations.
• 5. Role Play Activity Imagine if measurements didn’t exist or if you had to deal with someone who didn’t understand measurement. •What could happen? •What couldn’t happen? •Each group will have a different location. •Construct a short role play in that location
• 6. Success Criteria A short role play (2-3 minutes) set in the location given.  One or more of your characters does not understand or recognise measurement as an idea OR measurement as an idea does not exist.  Development of a problem caused by the absence of measurement.  Entertainment 
• 7. How can we measure?  Technology has only existed since the industrial revolution. How did people measure before then?  What could we use to measure?
• 8. Ancient Measures Length Digit  Hand span  Cubit  Furlong (distance a  plow team could drive without resting the horses) Weights and volumes      Grain (of barley) Penny weights (coins) Cups Barrels Mouthfuls!
• 9. Imperial Measures Imperial Standard units were made law in 1824 in England and were brought to Australia by British settlers. Used in Australia until 1966. Length Weights and volumes Inch (3 barley corns)  Foot (12 inches)  Yard (3 feet or a stride)  Mile (5000ish feet)   Ounces  Pounds (7000 grains or 16 oz)  Stones (2 wool sacks or 14 lbs)  Tons (2000 lbs)
• 10. 1791 First adopted in France soon after the revolution. Metre based on circumference of the Earth. Litre is based on the weight of water. 1960 1970 Global scientific community agree to adopt the SI metric system Government pass the metrification bill 1977 Australian metrification completed 2013
• 11. 1800 1900 1980
• 12. Group and order these units ms km m cm3 Gl cm kg Ml h s l mg mm g ml tonne
• 13. Group and order these units How did it but… How do you do it? kg base unit prefix size ml measurement
• 14. Prefixes Giga G Billion (1 000 000 000) Mega M Million (1 000 000) Kilo k Thousand (1 000) Centi c Hundredth (1/100 or 0.01) Milli m Thousandth (1/1000 or 0.001) Micro μ Millionth (1/1000000 or 0.000001) Nano n Billionth (1/1000000000 or 0.000000001)
• 15. SI base Units Measurement Base unit length Metres (m) mass Kilograms (kg) temperature Kelvin (K) time Seconds (s) current Ampere (A) amount of substance Mole (M)
• 16. Base units build to make other units N (kgm/s2) m/s m s s kg kg
• 17. Conversions Rule If the units get bigger the numbers get smaller. If the units get smaller the numbers get Example 1 100 bigger. metres is the same as 0.1 kilometres 100 metres is the same as 10 000 centimetres 100 metres is the same as 100 000 millimetres
• 18. Conversions can get messy  Learn how to put units into order of size.  Remember the rule! It will tell you when you have gone wrong.  Only then can you worry about conversion factors HINT: convert to base unit first