# Y2_T4_LSN_4.2

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1 / 21
Slide 1: Tekstslide
ScienceMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 21 slides, met interactieve quizzen en tekstslides.

## Onderdelen in deze les

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#### Slide 1 -Tekstslide

Topic 4
Moving in the world

#### Slide 2 -Tekstslide

Plan for today
• Explanation T4.2 Speed
• Make homework

4.2 Speed

#### Slide 4 -Tekstslide

Learning goals
I can....
• describe the concept of speed and understand which measurements and units are necessary to calculate it
• calculate the speed (or distance or time) of an object using the speed formula
• convert speed between the units of m/s and km/h
• create and interpret s,t-diagrams relating to an object's motion

Key words
• Speed
•  s,t-diagram

#### Slide 6 -Tekstslide

Speed
The speed of an object tells us how far it moves in a certain amount of time.

It is calculated with the following formula:

#### Slide 7 -Tekstslide

distance can be calculated with the following formula
A
s = v/t Distance = speed / time
B
s = t/v distance = time/ speed
C
s = v x t distance = speed * time
D
t = s x v time = distance * speed

#### Slide 8 -Quizvraag

time can be calculated with the following formula
A
t= v/s time = speed / distance
B
t = s/v time = distance /speed
C
t = s x v time = distance * speed
D
t = s + v time = distance + speed

#### Slide 9 -Quizvraag

Units of speed
The speed can be given in 2 different units:
• m/s (meters per second)
• km/h (kilometers per hour)

#### Slide 10 -Tekstslide

Speed question
Calculate the average speed of the green car (in m/s)

#### Slide 11 -Tekstslide

Speed question
In the first 3 hours the green car
rode a distance of 60 km

so :
s = 60 km
t = 3 hours

#### Slide 12 -Tekstslide

Speed question
FICA:

F: v = s/t
I:  s=60  t=3
C: v= 60/3 = 20 (km/h)
v = 20/3,6
A: v = 5,6 m/s

#### Slide 13 -Tekstslide

Convert 100 km/h to m/s?
A
27,8 m/s
B
360 m/s
C
103,6 m/s
D
96,4 m/s

#### Slide 14 -Quizvraag

convert 18 m/s to km/h
A
14,4 km/h
B
65 km/h
C
5 km/h
D
21,6 km/h

#### Slide 15 -Quizvraag

s,t-diagram
An s,t -Diagram is a graph that shows the movement of an object.

it shows the distance (s) and the time (t)

#### Slide 16 -Tekstslide

s,t-diagram
What does this graph tell you?

#### Slide 17 -Tekstslide

s,t-diagram
In the first 25s the object is moving 200 m

In the second 20s the object has stopped

In the last seconds the object is coming
back a 100 m

#### Slide 18 -Tekstslide

How far is the object after 16 seconds?
A
500 km
B
1000 km
C
0 km
D
300 km

#### Slide 19 -Quizvraag

What is the speed of the object at 11 seconds?
A
0 m/s
B
you can't tell
C
500 m/s
D
500 km/h

#### Slide 20 -Quizvraag

Homework
• Study the glossary of 4.2
• Complete the exercises of 4.2 (p. 166-111)
timer
10:00