# Lesson 4 — More indepth on calculating speed

Lessonplan
Lesson plan
Opening

Class phase

Solo phase

Closing
Learning goals
Mention at the end of the lesson that you will check the homework next lesson
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Slide 1: Tekstslide
Natuurkunde / ScheikundeMiddelbare schoolhavoLeerjaar 1

In deze les zitten 25 slides, met tekstslides.

## Onderdelen in deze les

Lessonplan
Lesson plan
Opening

Class phase

Solo phase

Closing
Learning goals
Mention at the end of the lesson that you will check the homework next lesson

#### Slide 2 -Tekstslide

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

#### Slide 3 -Tekstslide

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

Class Phase

#### Slide 5 -Tekstslide

Speed:
How fast something is moving

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

#### Slide 6 -Tekstslide

Formula for speed
Speed=timedistance

#### Slide 7 -Tekstslide

Formula for speed
Speed=timedistance
v=td

#### Slide 8 -Tekstslide

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

#### Slide 9 -Tekstslide

Rearranging the formula for speed
v=td
3=26

#### Slide 10 -Tekstslide

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

#### Slide 11 -Tekstslide

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

#### Slide 12 -Tekstslide

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

Converting
km/h <-> 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?

• In one hour the car travels 72km = 72000 m
• One hour = 3600 seconds
• So in 3600 seconds it travels 72000 m
• Then in 1 second it travels 72000/3600 = 20 m/s
• So a speed of 72km/h converts to 20 m/s

#### Slide 16 -Tekstslide

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

The cyclist travels 7 meters in one second
There are 3600 seconds in one hour
So in one hour the cyclist travels 7m x 3600 = 25200m
25200m = 25.2 km. the cyclist travels 25.2 km in on hour.
So a speed of 7 m/s converts to 25km/h.

#### Slide 17 -Tekstslide

km/h —> m/s
The speed x 1000/3600

m/s —> km/h
The speed x 3600/1000

#### 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
km/h —> m/s
The speed x 1000/3600

m/s —> km/h
The speed x 3600/1000

#### 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