Lesson 3— More indepth on calculating speed

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Natuurkunde / ScheikundeMiddelbare schoolhavoLeerjaar 1

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Slide 1 - Tekstslide

Lesson plan
  • Rearranging the formula for speed
  • Converting km/h <-> m/s
  • Exercises on calculating speed

Slide 2 - Tekstslide

Goals
  • Know how to rearrange the formula for speed
  • Know how to convert km/h <-> m/s

Slide 3 - Tekstslide

Class Phase

Slide 4 - Tekstslide

Speed:
How fast something is moving

Average speed
total distance divided
by total time
Steady speed
Traveling at a constant speed

Slide 5 - Tekstslide

Formula for speed
Speed=timedistance
v=td

Slide 6 - Tekstslide

Formula for speed
Speed=timedistance
v=td
v: velocity
d: distance
t: time

Slide 7 - Tekstslide

Rearranging the formula for speed
v=td
3=26

Slide 8 - Tekstslide

Rearranging the formula for speed
v=td
Speed: 
Distance:
Time:

Slide 9 - Tekstslide

Rearranging the formula for speed
v=td
Speed: 
Distance:
d=vt
Time:

Slide 10 - Tekstslide

Rearranging the formula for speed
v=td
Speed: 
Distance:
d=vt
Time:
t=vd

Slide 11 - Tekstslide

Converting 
km/h <-> m/s 

Slide 12 - Tekstslide

Converting m/s to km/h​
1m/s is how many km/h?​

1m/1s = 0.001km/1:3600h​= 3.6km/1h​
So 1m/s = 3.6 km/h​



Slide 13 - Tekstslide

Converting km/h to m/s​
1km/h is how many m/s
1km/1h =1000m/3600s​​
1km/h = 1000:1000 m/3600:1000 s​​
1km/h = 1 / 3.6 m/s
So 1km/h = 1/3.6 m/s​








Slide 14 - Tekstslide

Exercise
  • A car travels 72km/h. What is that in m/s?
  • A cyclist travels 7 m/s. What is that in km/h?

Slide 15 - Tekstslide

Exercise
  • A car travels 72km/h. What is that in m/s?



72: 3.6 = 20 m/s

Slide 16 - Tekstslide

Exercise
  • A cyclist travels 7 m/s. What is that in km/h?


7* 3.6 = 25.2 km/h

Slide 17 - Tekstslide

km/h —> m/s
The speed : 3.6

m/s —> km/h
The speed x 3.6

Slide 18 - Tekstslide

Exercise
Convert a speed of 38 km/h to m/s
Convert a speed of 1.5 m/s to km/h

38:3.6= 10.56 m/s
1.5* 3.6 = 5.4 km/h

Slide 19 - Tekstslide

Exercise
Convert a speed of 38 km/h to m/s      =      10.55 m/s
Convert a speed of 1.5 m/s to km/h      =      5.4 km/h
km/h —> m/s
The speed x 1000/3600

m/s —> km/h
The speed x 3600/1000

Slide 20 - Tekstslide

Solo Phase

Slide 21 - Tekstslide

Exercises on 
calculating speed

Slide 22 - Tekstslide

Goals
  • Know how to rearrange the formula for speed
  • Know how to convert km/h <-> m/s

Slide 23 - Tekstslide

Next lesson
Homework:
Complete the worksheet

Slide 24 - Tekstslide

A car is travelling 40 km/h. the distnace travelled is 400 km. Calculate the time.

Slide 25 - Tekstslide