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: Diapositive
Natuurkunde / ScheikundeMiddelbare schoolhavo, vwoLeerjaar 2

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This lesson

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

Slide 1 - Diapositive

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 - Diapositive


Recap?

Slide 3 - Diapositive

Formula for speed
Speed=timedistance
v=td
v: velocity
d: distance
t: time

Slide 4 - Diapositive

Rearranging the formula for speed
v=td
3=26

Slide 5 - Diapositive

Rearranging the formula for speed
v=td
Speed: 
Distance:
d=vt
Time:
t=vd

Slide 6 - Diapositive

Converting 
km/h <-> m/s 

Slide 7 - Diapositive

Discussing 
the worksheet

Slide 8 - Diapositive

Discussing 
the worksheet

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

Slide 9 - Diapositive

4.2 Taking accurate measurements

Slide 10 - Diapositive

Key concepts
  •  Precision
  • Accuracy
  • Significant figures
  •  Reaction time
  • Timing gates

Slide 11 - Diapositive

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 - Diapositive

 Precision and accuracy?

Slide 13 - Diapositive

Slide 14 - Diapositive

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 - Diapositive

Usain bolt




Time:
Yohan Blake




Time:
Justin Gatlin




Time:

Slide 16 - Diapositive

Usain bolt




Time: 10 s
Yohan Blake




Time: 10 s
Justin Gatlin




Time: 10 s
Their 2012 times
1 significant number

Slide 17 - Diapositive

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 - Diapositive

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 - Diapositive

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 - Diapositive

Homework
Read: 4.2
Do: 4.2 yellow block exercises

Slide 21 - Diapositive

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 - Diapositive

Slide 23 - Vidéo