1.3 & 1.1 Accuracy & Conversions & 1.1

• Natuurkunde / Scheikunde
• Middelbare school
• vmbo b, k, t, havo, vwo
• Leerjaar 1-3

Regels van orde

1e keer:  Waarschuwing --> Maximaal 3 namen op het bord

2e keer: Kleine schrijfopdracht op de gang

3e keer: Eruit, naar Loket 21

Nooit! 

Geluid uit telefoons / Oordopjes in 
Gooien
Eten/drinken 

Mutsen op / Jassen aan / Tassen op tafel  

Get your things please:                                

1.3 & 1.1 Accuracy, Conversions

• Questions about the homework?
• Quiz
• Conversion of units
• Accuracy
• Making some exercises of 1.1
• Don't lose your marbles!
• Formative Quiz

Homework: Questions?

The homework was:

• Read chapter 1.3
  
  
• Do exercises 26, 32, 33, 30

Homework: Questions??

• Homework was:
  
  
• Read chapter 1.3
  
• Do exercises 26, 32, 33, 30

A graded cylinder has it's highest bar set at 1000ml.
What is the measuring range?

1. 1 L
2. 1 litre
3. 0 - 1000ml
4. 1000 ml

Exchange:
The following person may explain:

V5

V2

What is the typical scale spacing of a home use thermometre?

1. -20 °C to 50 °C
2. 1
3. 0,1
4. 1 °C

Exchange:
The following person may explain:

V5

V2

How many kg are in a gram?

1. 1000 kg
2. 0,001 kg
3. 1000 g
4. 0,001 g

Exchange:
The following person may explain:

V5

V2

From mega to micro

• mega                   M                 1.000.000                  million
• kilo                        k                           1.000                   thousand
• deci                      d                                   0,1                one tenth               1/10
• centi                    c                                    0,01             one hundredth    1/100
• milli                      m                                  0,001           one thousandth  1/1000
• micro                  µ                                    0,000 001  one millionth        1/1.000.000

Learning objectives

• You can explain why each measurement has an inaccuracy.     (Except counting numbers)
  
  
• You can name three ways of expressing the amount of matter.

Measurement
accuracy

How accurate
can you read out the
temperature here?

26°C?  26,0°C? 26,00°C?        

Measurement
accuracy

I would say:

26,0°C +/- 0,5°C

which means

in between 25,5°C and 26,5°C              

Measuring: Always inaccuracy

How much mass of air is there in this classroom?

.

1. Discuss what you need to calculate and measure this
   
   
2. Make 5 groups of 2 or 3 persons
   
   

How much mass of air is there in this classroom?

.

1. Group 1: Measures the width or the room in m.
   
2. Group 2: Measures the length/depth of the room in m.
3. Group 3: Measures the height of the room in m.
   
   
4. Group 4: Searches internet for the air density
   double check: find it twice on different websites in the unit of kg/m³
   
   5. Collects all data from the groups, writes it on the board
   and calculates mass in kg.

Making excercises

Try it yourself, and feel free to quietly consult your neighbour.

Copy the table of conversions from Mega to micro

Do exercises
1, 2, 3, 4, 5, 6, 7, 8 of Ch1.1

Homework = 1,2,3,4,5

12:30

Don't loose your marbles!

12:43

I am measuring some chocolate on
a digital scale in grams.

What is correct?

1. I've measured exactly 412 g.
2. I've measured between 411,9 g and 412,1 g.
3. I've measured 412,0 g.
4. I've measured between 411,5 g and 412,5 g.

I want to bring my marbles on an airplane trip, but I don't know if I'm allowed to bring them on the plane.
What should I measure?

1. The number, without a unit
2. The mass in the unit of kg
3. The volume in L or in m³

Quantities & Units

quantity	symbol	unit	abbreviat.	m. instrum.
mass	m	kilogram	kg	scales
volume	V	litre	L	graduated cylinder
length/distance	l / s	metre	m	ruler, measuring tape
temperature	T	degree Celcius	°C	thermometer
time interval	t	second	s	clock, stopwatch
number	-	-	-	counter

Scale spacing

&
Measuring range