Lesson 6 — 4.2 Taking accurate measurments

This lesson

Recap
Measuring time Precisely
Reaction time

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Slide 1: Slide

Natuurkunde / ScheikundeMiddelbare schoolhavo, vwoLeerjaar 2

This lesson contains 26 slides, with text slides and 1 video.

Items in this lesson

This lesson

Recap
Measuring time Precisely
Reaction time

Slide 1 - Slide

Learning goals

Define reaction time
Know how to measures time precisely
Measure your own reaction time

Slide 2 - Slide

What did we cover

previous lesson?

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

4.2 Taking accurate measurements

Slide 8 - Slide

Key concepts

Precision
Accuracy
Significant figures
Reaction time
Timing gates

Slide 9 - Slide

Precision and accuracy?

Slide 10 - Slide

Slide 11 - 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.

Slide 12 - Slide

Slide 13 - Video

Usain bolt

Time:

Yohan Blake

Time:

Justin Gatlin

Time:

2012 olympics — 100 m sprint

Slide 14 - Slide

Usain bolt

Time: 10 s

Yohan Blake

Time: 10 s

Justin Gatlin

Time: 10 s

Their 2012 times

1 significant number

Slide 15 - 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 16 - 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 17 - 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 that are meaningful for the measurement.

Slide 18 - Slide

Key concepts

Precision
Accuracy
Significant figures
Reaction time
Timing gates

Slide 19 - Slide

Reaction time?

Timing gates?

Slide 20 - Slide

Slide 21 - 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 that are meaningful for the measurement.

Reaction time: The time it takes for you to react to something.

Timing gates: Two lights a certain distance apart from each other which record if an object passes it.

Slide 22 - Slide

Worksheet

Slide 23 - Slide

Homework

for next lesson

Do the workbook exercises §4.2
Complete the worksheet

Slide 24 - Slide

Learning goals

Define reaction time
Know how to measures time precisely
Measure your own reaction time

Slide 25 - Slide

Homework

The workbook exercises §4.2
Complete the worksheet

Slide 26 - Slide

Lesson 6 — 4.2 Taking accurate measurments

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