Average speed

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Slide 1: Slide
NatuurkundeMiddelbare schoolvwoLeerjaar 2

This lesson contains 20 slides, with interactive quizzes, text slides and 2 videos.

Items in this lesson

Slide 1 - Slide

Your speed will decide what distance 
you will travel every second.

Slide 2 - Slide

Slide 3 - Video

Speed, distance & time
Speed
Time
Distance
10 km/h
1 h
10 km/h
5 h
50 km/h
3 h

Slide 4 - Slide

The formula
For constant speeds, we have the following formula:



v is the speed in meters per second (m/s)
s is the distance in meters (m)
t is the time in seconds (s)
v=ts

Slide 5 - Slide

Johnny drives from his house to school. This trip is 4,5 km long and takes 10 minutes. Calculate his average speed
A
450 km/h
B
0.45 km/h
C
27 km/h
D
45km/h

Slide 6 - Quiz

Eliod Kipchoge
On October 12th 2019, Eliod Kipchoge became the first human to complete a marathon 
(42.195 km) in under 2 hours!
What was his average running
speed? 
Use 1 hour and 59 min as his
finishing time.

Slide 7 - Slide

What was the average running
speed of Eliod Kipchoge?

Slide 8 - Open question

Slide 9 - Slide

Two kinds of speed
Instantaneous and average speed

The instantaneous speed is the speed of an object at a particular moment (instant) in time.

The average speed on the other hand can be calculated by dividing the distance travelled by the total time it has taken to do so. 

The next two videos will explain 
to you how to calculate the instantaneous speed and the average speed.

Slide 10 - Slide

Slide 11 - Video

A graph of the speed
On the y-axis (vertical),    we put the speed.

On the x-axis (horizontal), we put the time.

So what would constant speed look like?

Slide 12 - Slide

A graph of the speed
Constant speed, means that v stays the same all the time!

Slide 13 - Slide

A graph of the speed
Constant speed, means that v stays the same all the time!

How much distance is travelled here?

Slide 14 - Slide

How much distance is travelled?

Slide 15 - Open question

A graph of the speed
How can we calculate the distance in this diagram? 


Slide 16 - Slide

A graph of the speed
How can we calculate the distance in this diagram? 
--> We use the average
       speed


Slide 17 - Slide

A graph of the speed
How can we calculate the distance in this diagram? 
--> We use the average
       speed

How can we calculate the average speed here?

Slide 18 - Slide

A graph of the speed
How can we do this here?
--> We use the average
       speed

How can we calculate the average speed here?

vavg=2vinital+vfinal

Slide 19 - Slide

Working on the exercises
Read: p. 8 - 11
Make: section 2
Start with exercise 10!
Not finished? --> Homework!
Finished? Start Test Yourself section 2

Slide 20 - Slide