 Speed Calculations.

Presentation on theme: "Speed Calculations."— Presentation transcript:

Speed Calculations

Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? Given Given F Formula Work Answer

Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? Given Given F Formula Work Answer Look for what is given.

Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? Given Given F Formula Work Answer d = 10 km

Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? Given Given F Formula Work Answer d = 10 km t = 40 min

Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? Given Given F Formula Work Answer d = 10 km t = 40 min What does the problem ask for?

Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? Given Given F Formula Work Answer d = 10 km t = 40 min

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

Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? Given Given F Formula Work Answer d = 10 km t = 40 min s = d/t

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

Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? Given Given F Formula Work Answer d = 10 km t = 40 min s = d/t s = 10 km / 40 min.

Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? Given Given F Formula Work Answer d = 10 km t = 40 min s = d/t s = 10 km / 40 min. And solve!

Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? Given Given F Formula Work Answer d = 10 km t = 40 min s = d/t s = 10 km / 40 min. s = 0.25 km/min * 60 min. / hr =

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

Speed Calculations A cross-country runner runs 10 km in 40 minutes. What is his average speed? Given Given F Formula Work Answer d = 10 km t = 40 min s = d/t s = 10 km / 40 min. s = 0.25 km/min * 60 min. / hr = 15 km/hr

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. Given Given F Formula Work Answer

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. Given Given F Formula Work Answer Look for what is given.

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. Given Given F Formula Work Answer vi=48 km/hr

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. Given Given F Formula Work Answer vi=48 km/hr vf= 75 km/hr

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. Given Given F Formula Work Answer vi=48 km/hr vf= 75 km/hr t = 27 hrs

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. Given Given F Formula Work Answer vi=48 km/hr vf= 75 km/hr t = 27 hrs What does the problem ask for?

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. Given Given F Formula Work Answer vi=48 km/hr vf= 75 km/hr t = 27 hrs

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. Given Given F Formula Work Answer vi=48 km/hr vf= 75 km/hr t = 27 hrs What formula is required to find the answer?

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. Given Given F Formula Work Answer vi=48 km/hr vf= 75 km/hr t = 27 hrs a=(vf-vi)/t

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. Given Given F Formula Work Answer vi=48 km/hr vf= 75 km/hr t = 27 hrs a=(vf-vi)/t Now, plug in the values and solve!

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. Given Given F Formula Work Answer vi=48 km/hr vf= 75 km/hr t = 27 hrs a=(vf-vi)/t a=(75 km/hr – 48 km/hr) / 27 hrs

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. Given Given F Formula Work Answer vi=48 km/hr vf= 75 km/hr t = 27 hrs a=(vf-vi)/t a=(75 km/hr – 48 km/hr) / 27 hrs a= 27km/hr / 27 hr = 1 km/hr2

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. Given Given F Formula Work Answer vi=48 km/hr vf= 75 km/hr t = 27 hrs a=(vf-vi)/t a=(75 km/hr – 48 km/hr) / 27 hrs a= 27km/hr / 27 hr = 1 km/hr2 Write the answer in the answer section. Do not forget the units!

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. Given Given F Formula Work Answer vi=48 km/hr vf= 75 km/hr t = 27 hrs a=(vf-vi)/t a=(75 km/hr – 48 km/hr) / 27 hrs a= 27km/hr / 27 hr = 1 km/hr2 a=1 km/hr2