# Lesson 3 — doing calculations

TTO 2 – Science
Chapter 4. Speed
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Slide 1: Tekstslide
SpeedMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 13 slides, met tekstslides.

## Onderdelen in deze les

TTO 2 – Science
Chapter 4. Speed

#### Slide 1 -Tekstslide

Learning goals
• You can explain the difference between steady and average speed.

• You can name the formula for speed.

• You can rearrange the formula for speed.

• You can use the formula for speed to do different kinds of calculations.

What is speed?

#### Slide 3 -Tekstslide

The highest speed possible in the universe?

#### Slide 4 -Tekstslide

The speed of light!

#### Slide 5 -Tekstslide

The speed of light!
• About 300 000 000 m/s

• About 300 000 km/s

• To be precise:
299 792 458 m / s

• In physics its is given the symbol 'c'

#### Slide 6 -Tekstslide

Speed
Speed=timeDistance
v=td
New physical quantity:
Speed

Unit of Speed:
• m/s
• Km/h

Formula
• v: speed (meters/second) m/s)
• d: distance (meters) (m)
• t: time (seconds) (s)
The amount of distance something is traveling over a certain time.
Examples:
• A runner is running at a speed of 3/ms
• A car on the highway is driving at a speed of 120 km/h

#### Slide 7 -Tekstslide

Doing calculations
When doing calculations, use the following steps:
• Given
• Formula
• Calculate

#### Slide 8 -Tekstslide

Exercise
The space-x rocket called Falcon 9 travels at a speed of 5950 km/h. calculate how many kilometers it would travel in 2,5 days.

#### Slide 9 -Tekstslide

Average speed and steady speed
A consistent speed over time.

Average speed:
The average speed over a certain amount of time.

#### Slide 10 -Tekstslide

Average speed
avaragespeed=totaltimetotaldistance

#### Slide 11 -Tekstslide

Exercise
Two friends go on a road trip for three days.
On the first day they travel 765 km in 8,5 hours.
On the second day they travel 660 km in 6 hours.
On the third day they travel 630 km in 9 hours.

Calculate their average speed.
avaragespeed=totaltimetotaldistance

#### Slide 12 -Tekstslide

Homework
Worksheet calculations speed
Exercise 1 - 5