# Lesson 12 – speed-time graphs + terminal velocity

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Slide 1: Tekstslide
Natuurkunde / ScheikundeMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 18 slides, met tekstslides en 1 video.

## Onderdelen in deze les

#### Slide 1 -Tekstslide

This lesson
• Recap rearranging the formula for acceleration
• speed time graph + terminal velocity
• Check 4.4 + working independently

#### Slide 2 -Tekstslide

Learning goals 4.4
• Rearrange the formula for acceleration
• Read a speed-time graph correctly
• Explain terminal velocity

#### Slide 3 -Tekstslide

a=tvfvi
vf=(at)+vi
vi=vf(at)
t=avfvi
Acceleration:
final velocity:
Initial velocity:
Duration of the acceleration:

#### Slide 4 -Tekstslide

• A car accelerates at a rate of 13m/s2 for 6 seconds, it reaches a speed of 128 km/h. Calculate its initial speed.

• A rocket launching  accelerates from rest a rate of 1.5 km/s2 for 0.00222222222 Hour (8 seconds). Calculate the speed it reaches.

• A cyclist decelerates from 22 m/s to a speed of 37 m/s at a rate of 7,5 m/s2. Calculate the time this took.

#### Slide 5 -Tekstslide

Speed-time graphs

#### Slide 6 -Tekstslide

The slope of the line shows the velocity of the movement

#### Slide 7 -Tekstslide

The slope of the line shows the acceleration of the movement

#### Slide 8 -Tekstslide

Speed-time graphs

Flat line:
constant velocity

Deceleration

#### Slide 9 -Tekstslide

What does the area under a graph tell you?

#### Slide 10 -Tekstslide

What does the area under a graph tell you?
• Area = length x width

• Area under speed time graph =  speed x time

•  speed x time = distance traveled

#### Slide 11 -Tekstslide

Calculate the distance traveled in this journey

#### Slide 12 -Tekstslide

Terminal velocity

#### Slide 15 -Video

Check worksheet 4.4

• Done: Start studying chapter 4

#### Slide 16 -Tekstslide

Learning goals 4.4
• Rearrange the formula for acceleration
• Read a speed-time graph correctly
• Explain terminal velocity

Homework