# Lesson 3— More indepth on calculating speed

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Slide 1: Tekstslide
Natuurkunde / ScheikundeMiddelbare schoolhavoLeerjaar 1

In deze les zitten 25 slides, met tekstslides.

## Onderdelen in deze les

#### 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

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

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

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

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.