Presentation on theme: "GCSE: Units Dr J Frost GCSE Revision Pack Ref: 157, 158, 160"— Presentation transcript:
1 Dr J Frost (firstname.lastname@example.org) GCSE: UnitsDr J FrostGCSE Revision Pack Ref: 157, 158, 160Last modified: 13th April 2015
2 GCSE Specification(Using revision pack reference numbers)157. Convert between units of measure in the same system. (NB: Conversion between imperial units will be given, metric equivalents should be known.)158. Know rough metric equivalents of pounds, feet, miles, pints and gallons: Metric/ImperialConvert between imperial and metric measures160. Convert between metric units of speed eg km/h to m/s
3 1 m = 100 cm 1cm = 10 mm 1 ton = 1000 kg 1 kg = 1000 g 1 𝑙 = 1000 ml Metric ↔ Metric Conversions1 m = 100 cm1cm = 10 mm1 ton = 1000 kg1 kg = 1000 g1 𝑙 = 1000 ml1 𝑙 = 1000 cm3??????
5 Metric ↔ Imperial Conversions You need to memorise these for your GCSE exam!1 kg ≈ pounds (≈ means ‘approximately equal to’)1 litre ≈ pints4.5 litres ≈ gallon8 km ≈ miles30cm ≈ foot?????Test Your Understanding5.4kg = pounds49.69 pints = litres40km = miles75cm = foot?30 miles = km28km = miles480 miles = km??????
7 Converting between compound units 30m/s65m/s 1000?0.03 km/s?× 3600?108 km/h234 km/h??
8 Test Your Understanding 175 m/s45km/h630 km/h12.5 m/s??
9 ExercisesThe radius of the Earth is 6371kmHow many miles is that? 3982 milesLondon and Auckland are at exact opposites of the Earth. If I fly at 450mph, how many hours will it take to get there? 27.8 hoursUsain Bolt can run m/s. What is that in:km/h? km/hmph? mphPippin the cat weighs 9.2 pounds. I want to enter Pippin along with cats of the same weight into Crufts. My total weight limits is 1 ton of cat. How many cats can I take?239 catsConvert the following:650 km/h → m/s1 m/s → km/h15[Edexcel] Emily is driving in France. She sees this sign. Emily is going to drive to Dijon. She plans to drive at an average speed of 50 miles per hour. Work out how long it should take Emily to drive to Dijon.To experiment to see if cats land on their feet, I release Pippin upside down at the top of a 6000 foot drop. What is that in km?1.8kmThe average human consumes about 7.6 pints of cow’s milk a day. How many litres is that in a year? litresIf my Ferrari consumes 6 gallons of petrol each hour and my Aston 8 gallons each hour, what is the difference in time in seconds, between the two cars, to consume a litre of petrol? 33.3 seconds??2?6 hours??63?7??48???