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Answer = 6.22m/s

Starter. Jessica Ennis ran her 0.8km Olympic heptathlon race in a time of 2:08.65. What was her average speed?. ?. Answer = 6.22m/s. The formula relating speed-distance time:. d. s. t. The unit of speed might for example be m/s or kmph . How does the unit help us remember the formula?.

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Answer = 6.22m/s

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  1. Starter Jessica Ennis ran her 0.8km Olympic heptathlon race in a time of 2:08.65. What was her average speed? ? Answer = 6.22m/s The formula relating speed-distance time: d s t The unit of speed might for example be m/s or kmph. How does the unit help us remember the formula?

  2. Quickfire Qs Speed Distance Time ? 2m/s 10m 5s d ? 5m/s 24m 4.8s ? s t 0.2km/s 50km 250s ? 5km/h 10km 7200s

  3. Examples Jeremy Clarkson travels 250 miles at a constant speed of 100mph. How much time has elapsed? Answer: 2 hours 30 minutes Getting your units right! Hans Solo and Chewbacca activate their warp drive and travel at the speed of light. Light travels at a speed of 299792.458 km/s. What distance have they travelled after a year? Choose  6,460,000,000,000,000m 9,460,000,000,000,000m Choose  12,460,000,000,000,000m Choose  15,460,000,000,000,000m  Choose

  4. Density The density of a rock is 2.75g/cm3. Using the unit, can you guess the formula for density? ? This is a rock.

  5. Activity Take your pick: Easier and Medium Medium and Difficult (Merits to anyone who gets both of the Difficult questions correct) E1) 33 minutes 20 seconds E2) 500g/cm3 M1) 3.3kg M2) 38 laps D1) 25% D2) 2 ¼ hours ? ? ? ? ? ?

  6. Exercises Rayner Year 9 Chapter 5.3, Page 160 Exercise 1: Q3, 6, 9, 12, 15. Exercise 2: Q8, 10, 13, 15.

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