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Published byBrian Edward Modified over 2 years ago

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Compound Measures OCR Stage 6

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Speed - Distance - Time Part 1

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What is speed? How far you travel in a certain time Speed = Distance ÷ Time We call the result the average speed

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SDT Triangle s d t x You have seen this in Science?

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s d t x We can use this to find any one thing IF we know the other two! By covering up what you want Speed? = d t Distance? = s x t Time? = d ÷ s

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A train travels 120 miles in 2 hours What is its average speed? s d t x = d t Speed s = 120 ÷ 2 s = 60 mph MUST give UNITS MILES per HOUR

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A runners average speed is 8m/s, how far does he run in 25 seconds ? s d t x =s x t Distance d = 8 x 25 d = 200 metres MUST give UNITS Because speed was in METRES per second

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A lorry leaves Stoke, travels 150km to Leeds at an average speed of 60km/h. How long did the journey take? s d t x = d s Time t = 150 ÷ 60 t = 2.5 hours MUST give UNITS Because speed was in km per HOUR

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Car travels 40km in 20 minutes. What is its average speed in kph? s d t x = d t Speed s = 40 ÷ 1/3 s = 120kph

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Density – Mass - Volume Part 2

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What is Density? Weight of a given amount of a material Density = Mass ÷ Volume

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DMV Triangle d m v x You have seen this in Science?

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d m v x We can use this to find any one thing IF we know the other two! By covering up what you want Density? = m v Mass? = d x v Volume? = m d

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A steel girder weighs 2500 kg and has a volume of 100m 3 What is its density? d m v x = m v Density d = 2500 ÷ 100 Kg/m 3 MUST give UNITS Kilograms per Cubic Metre = 25

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Population Density Part 3

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A town in S France has a population of 120,000 living in an area of 15km 2 What is the population density? d p a x = p a Population densityd = ÷ 15 people / km 2 MUST give UNITS People per Square Kilometre d = 8000

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