1 / 16

Compound Measures

Compound Measures. OCR Stage 6. Speed - Distance - Time. Part 1. What is speed?. How far you travel in a certain time Speed = Distance ÷ Time We call the result “the average speed”. d. s. t. x. SDT Triangle. You have seen this in Science?. d. s. t. x.

keisha
Download Presentation

Compound Measures

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Compound Measures OCR Stage 6

  2. Speed - Distance - Time Part 1

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

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

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

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

  7. d s t x A runner’s average speed is 8m/s, how far does he run in 25 seconds ? d = 8 x 25 =s x t Distance d = 200 metres MUST give UNITS Because speed was in METRES per second

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

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

  10. Density – Mass - Volume Part 2

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

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

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

  14. m d v x A steel girder weighs 2500 kg and has a volume of 100m3What is its density? d = 2500 ÷ 100 = m v Density = 25 Kg/m3 MUST give UNITS Kilograms per Cubic Metre

  15. Population Density Part 3

  16. p d a x A town in S France has a population of 120,000 living in an area of 15km2What is the population density? d = 120 000 ÷ 15 Population density = p a people / km2 d = 8000 MUST give UNITS People per Square Kilometre

More Related