Lesson 5 — Discuss worksheet – Start 4.2

This lesson

Recap
Discussing the worksheet
Start §4.2 — Taking accurate measurements
Working independently

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Slide 1: Slide

Natuurkunde / ScheikundeMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 23 slides, with text slides and 1 video.

Items in this lesson

This lesson

Recap
Discussing the worksheet
Start §4.2 — Taking accurate measurements
Working independently

Slide 1 - Slide

Learning goals

Check the worksheet
Explain the difference between accuracy and precision
Define significant figures
Define reaction time
Know how to measures time precisely

Slide 2 - Slide

Recap?

Slide 3 - Slide

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

Slide 4 - Slide

Rearranging the formula for speed

v = \frac{​ d ​ ​}{​ t ​}

3 = \frac{​ 6 ​ ​}{​ 2 ​}

Slide 5 - Slide

Rearranging the formula for speed

v = \frac{​ d ​ ​}{​ t ​}

Speed:

Distance:

d = v \cdot t

Time:

t = \frac{​ d ​ ​}{​ v ​}

Slide 6 - Slide

Converting

km/h <-> m/s

Slide 7 - Slide

Discussing

the worksheet

Slide 8 - Slide

Discussing

the worksheet

Compare your answers with your neighbour.
One of you gets an answer sheet, check your answers with the answers sheet.
Done —> Read: 4.2, do: Yellow block exercises + workbook exercises.

Slide 9 - Slide

4.2 Taking accurate measurements

Slide 10 - Slide

Key concepts

Precision
Accuracy
Significant figures
Reaction time
Timing gates

Slide 11 - Slide

Exercise

Define these concepts by discussing them with your neighbour

Precision
Accuracy
Significant figures

Use the book to figure out what they mean

Slide 12 - Slide

Precision and accuracy?

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Precision and accuracy

Accuracy: How close the measurement is to the actual value.

Precision: How refined the measurement is, shown in the number of significant numbers.

Slide 15 - Slide

Usain bolt

Time:

Yohan Blake

Time:

Justin Gatlin

Time:

2012 olympics — 100 m sprint

Slide 16 - Slide

Usain bolt

Time: 10 s

Yohan Blake

Time: 10 s

Justin Gatlin

Time: 10 s

Their 2012 times

1 significant number

Slide 17 - Slide

Usain bolt

Time: 9.6 s

Yohan Blake

Time: 9.8 s

Justin Gatlin

Time: 9.8 s

Their 2012 times

2 significant number

Slide 18 - Slide

Usain bolt

Time: 9.63 s

Yohan Blake

Time: 9.75 s

Justin Gatlin

Time: 9.79 s

Their 2012 times

3 significant number

Slide 19 - Slide

Precision and accuracy

Accuracy: How close the measurement is to the actual value.

Precision: How refined the measurement is, shown in the number of significant numbers.

Significant figures: The amount of digits in a measurment.

Slide 20 - Slide

Homework

Do: 4.2 yellow block exercises

Slide 21 - Slide

Learning goals

Check the worksheet
Explain the difference between accuracy and precision
Define significant figures
Define reaction time
Know how to measures time precisely

Slide 22 - Slide

Slide 23 - Video

Lesson 5 — Discuss worksheet – Start 4.2

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