Lesson 3— More indepth on calculating speed

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Natuurkunde / ScheikundeMiddelbare schoolhavoLeerjaar 1

This lesson contains 25 slides, with text slides.

Items in this lesson

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Lesson plan

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

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Goals

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

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Class Phase

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Speed:

How fast something is moving

Average speed

total distance divided

by total time

Steady speed

Traveling at a constant speed

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Formula for speed

S p e e d = \frac{​ d i s t a n c e ​ ​}{​ t i m e ​}

v = \frac{​ d ​ ​}{​ t ​}

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Formula for speed

S p e e d = \frac{​ d i s t a n c e ​ ​}{​ t i m e ​}

v = \frac{​ d ​ ​}{​ t ​}

v: velocity

d: distance

t: time

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Rearranging the formula for speed

v = \frac{​ d ​ ​}{​ t ​}

3 = \frac{​ 6 ​ ​}{​ 2 ​}

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Rearranging the formula for speed

v = \frac{​ d ​ ​}{​ t ​}

Speed:

Distance:

Time:

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Rearranging the formula for speed

v = \frac{​ d ​ ​}{​ t ​}

Speed:

Distance:

d = v \cdot t

Time:

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Rearranging the formula for speed

v = \frac{​ d ​ ​}{​ t ​}

Speed:

Distance:

d = v \cdot t

Time:

t = \frac{​ d ​ ​}{​ v ​}

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Converting

km/h <-> m/s

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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

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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

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Exercise

A car travels 72km/h. What is that in m/s?
A cyclist travels 7 m/s. What is that in km/h?

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Exercise

A car travels 72km/h. What is that in m/s?

72: 3.6 = 20 m/s

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Exercise

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

7* 3.6 = 25.2 km/h

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km/h —> m/s

The speed : 3.6

m/s —> km/h

The speed x 3.6

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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

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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

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Solo Phase

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Exercises on

calculating speed

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Goals

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

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Next lesson

Homework:

Complete the worksheet

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A car is travelling 40 km/h. the distnace travelled is 400 km. Calculate the time.

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Lesson 3— More indepth on calculating speed

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