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Speed Calculations. A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer.

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Presentation on theme: "Speed Calculations. A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer."— Presentation transcript:

1 Speed Calculations

2 A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer

3 Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer Look for what is given.

4 Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer d = 10 km

5 Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer d = 10 km t = 40 min

6 Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer d = 10 km t = 40 min What does the problem ask for?

7 Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer d = 10 km t = 40 min

8 Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer d = 10 km t = 40 min What formula will you use to find the answer?

9 Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer d = 10 km t = 40 min s = d/t

10 Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer d = 10 km t = 40 min s = d/t Now, plug in the given values into the formula.

11 Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer d = 10 km t = 40 min s = d/ts = 10 km / 40 min.

12 Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer d = 10 km t = 40 min s = d/ts = 10 km / 40 min. And solve!

13 Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer d = 10 km t = 40 min s = d/ts = 10 km / 40 min. s = 0.25 km/min * 60 min. / hr =

14 Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer d = 10 km t = 40 min s = d/ts = 10 km / 40 min. s = 0.25 km/min * 60 min. / hr = Write the answer in the answer section. Do not forget the units!

15 Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? GivenF FormulaWorkAnswer d = 10 km t = 40 min s = d/ts = 10 km / 40 min. s = 0.25 km/min * 60 min. / hr = 15 km/hr

16 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer

17 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer Look for what is given.

18 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer v i =48 km/hr

19 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer v i =48 km/hr v f = 75 km/hr

20 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer v i =48 km/hr v f = 75 km/hr t = 27 hrs

21 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer v i =48 km/hr v f = 75 km/hr t = 27 hrs What does the problem ask for?

22 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer v i =48 km/hr v f = 75 km/hr t = 27 hrs

23 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer v i =48 km/hr v f = 75 km/hr t = 27 hrs What formula is required to find the answer?

24 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer v i =48 km/hr v f = 75 km/hr t = 27 hrs a=(v f -v i )/t

25 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer v i =48 km/hr v f = 75 km/hr t = 27 hrs a=(v f -v i )/t Now, plug in the values and solve!

26 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer v i =48 km/hr v f = 75 km/hr t = 27 hrs a=(v f -v i )/t a=(75 km/hr – 48 km/hr) / 27 hrs

27 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer v i =48 km/hr v f = 75 km/hr t = 27 hrs a=(v f -v i )/t a=(75 km/hr – 48 km/hr) / 27 hrs a= 27km/hr / 27 hr = 1 km/hr 2

28 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer v i =48 km/hr v f = 75 km/hr t = 27 hrs a=(v f -v i )/t a=(75 km/hr – 48 km/hr) / 27 hrs a= 27km/hr / 27 hr = 1 km/hr 2 Write the answer in the answer section. Do not forget the units!

29 Acceleration Calculations Calculate the acceleration of an object that changes speed from 48 km/hr to a speed of 75 km/hr in 27 hrs. GivenF FormulaWorkAnswer v i =48 km/hr v f = 75 km/hr t = 27 hrs a=(v f -v i )/t a=(75 km/hr – 48 km/hr) / 27 hrs a= 27km/hr / 27 hr = 1 km/hr 2 a=1 km/hr 2


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