Lesson 4— 4.2 Taking accurate measurments

This lesson
  • Recap
  •  Measuring time Precisely
  • Reaction time
1 / 26
volgende
Slide 1: Tekstslide
Natuurkunde / ScheikundeMiddelbare schoolhavo, vwoLeerjaar 2

In deze les zitten 26 slides, met tekstslides en 1 video.

Onderdelen in deze les

This lesson
  • Recap
  •  Measuring time Precisely
  • Reaction time

Slide 1 - Tekstslide

Learning goals

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

Slide 2 - Tekstslide

What did we cover 
previous lesson?

Slide 3 - Tekstslide

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

Slide 4 - Tekstslide

Rearranging the formula for speed
v=td
3=26

Slide 5 - Tekstslide

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

Slide 6 - Tekstslide

Converting 
km/h <-> m/s 

Slide 7 - Tekstslide

4.2 Taking accurate measurements 

Slide 8 - Tekstslide

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

Slide 9 - Tekstslide

 Precision and accuracy?

Slide 10 - Tekstslide

Slide 11 - Video

Slide 12 - Tekstslide

Precision and accuracy
Accuracy: How close the measurement is to the actual value.

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


Slide 13 - Tekstslide

Usain bolt




Time:
Yohan Blake




Time:
Justin Gatlin




Time:

Slide 14 - Tekstslide

Usain bolt




Time: 10 s
Yohan Blake




Time: 10 s
Justin Gatlin




Time: 10 s
Their 2012 times
1 significant number

Slide 15 - Tekstslide

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 - Tekstslide

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 - Tekstslide

All zeros between nonzero numbers are significant numbers 
5006        4 significant numbers
407            3 significant numbers 
Zeros to the right of non zero numbers are insignificant
500   one  significant number
8000 one significant number 

Slide 18 - Tekstslide

Precision and accuracy
Accuracy: How close the measurement is to the actual value.

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

Significant figures: The number of digits in a measurment that are meaningful for the measurement.

Slide 19 - Tekstslide

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

Slide 20 - Tekstslide

Reaction time?

Timing gates?

Slide 21 - Tekstslide

Slide 22 - Tekstslide

Precision and accuracy
Accuracy: How close the measurement is to the actual value.

Precision: How refined or consistent 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 camera’s a certain distance apart from each other which record if an object passes it.


Slide 23 - Tekstslide

Worksheet

Slide 24 - Tekstslide

Homework
for next lesson

  • Do the workbook exercises §4.2
  •  Complete the worksheet

Slide 25 - Tekstslide

Learning goals

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

Slide 26 - Tekstslide