This lesson contains 13 slides, with interactive quizzes and text slides.
Lesson duration is: 50 min
Items in this lesson
Movement
Slide 1 - Mind map
Paragraph 2.1
Average speed
Slide 2 - Slide
Average speed
To calculate the average speed you will use the following formula:
average speed = distance
time
For these words we use the following symbols:
vavg = average speed (from the latin word velocitas)
s = distance (from the latin word spatio)
t = time
vavg=ts
Slide 3 - Slide
Average speed
Choose the units that you want to use
option 1: v in m/s; s in m; t in s
option 2: v in km/h; s in km; t in h
Always write your complete calculation with any exercise.
vavg=ts
Slide 4 - Slide
Example
A pedestrian walks in exactly 45 minutes a total distance of 4 km. What is their average speed?
Slide 5 - Slide
option 1
s = 4 km
t = 45 min = 0,75 h
v = s : t = 4 : 0,75 = 5,3 km/h
option 2
s = 4 km = 4000 m
t = 45 min = 2700 s
v = s : t = 4000 : 2700 = 1, 5 m/s
Slide 6 - Slide
Remember
Slide 7 - Slide
A cyclist takes 22 minutes to cycle a distance of 5 kilometer. What is their average speed? Give your entire calculation and answer with a unit.
Slide 8 - Open question
Hoe groot is de gemiddelde snelheid van de bal uit figuur 4 in je boek? Vul je hele berekening in.
Slide 9 - Open question
Flipping the formula
You can also use the formula to determine the distance travelled or the time spent travelling, you are then going to use a variation of the standard formula. Make sure you can use all three variations. You are allowed to use the formulas in words if preferred
vavg=ts
t=vavgs
s=vavg⋅t
Slide 10 - Slide
How long doest it take a car to drive a distance of 175 km if its speed is an average of 80km/h? Fill in the entire calculation.
Slide 11 - Open question
An athlete runs a path for 80 minutes long, their average speed was 14 km/h. What is the distance that they covered? Fill in the entire calculation.