1-5 Magnification factor (1.2)

Magnification factor (p. 25)
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- iPad

Report
- YES book controll


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Slide 1: Diapositive
NatuurkundeMiddelbare schoolhavoLeerjaar 2

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Magnification factor (p. 25)
Bluetooth 
- On


Stationary
- Books
- Pen and pencil
- Calculator
- iPad

Report
- YES book controll


Lessonup
- Yes
Bags in
the cuboard
Phones in the phone holder

Slide 1 - Diapositive

Lesson goals:
  • At the end of this lesson you should be able to make calculations with the magnification factor. 
  • At the end of this lesson, you must be able to write a scienctific report. 
Note: During the next lesson, you will do an experiment, and write a report

Slide 2 - Diapositive

Magnification factor
The factor by which the shadow is larger than the object, depends on the distance between the lamp and the object, and the distance between the lamp and the screen. 

Slide 3 - Diapositive

If the screen is twice as far from the lamp as from the object, the magnification factor is 2. 
6 m
3 m

Slide 4 - Diapositive

... and if the magnification factor is two, the shadow will be twice as large.
3 m
6 m

24 cm
48 cm

Slide 5 - Diapositive

Magnification factor formula  
length of shadow= N x length of object

N = magnification factor
Length of shadow
Length of object
N=VB

Slide 6 - Diapositive

Magnification factor formula
distance of shadow = N x distance of object
N =  magnification factor
distance of object
distance of shadow
N=vb

Slide 7 - Diapositive

What is the distance of the shadow?
A
10 cm
B
30 cm
C
40 cm
D
70 cm

Slide 8 - Quiz

Which formula is wrong?
A
length shadow= N/length object
B
N = length shadow/ length object
C
N = distance shadow/ distance object
D
length shadow = N x length object

Slide 9 - Quiz

Steps to do the sums:
Step 1: Write what you are given. 
Step 2: Write what you are asked.
Step 3: Write down the formula, with that which you 
                 want to calculate to the left of the = sign
Step 4: Substitute into the formula
Step 5: Solve the unknown value

Slide 10 - Diapositive

Example 1
During a shadow theatre a lamp is at a distance of 180 cm from the screen. A doll that is 16 cm tall, stands between the lamp and the screen at a distance of 60 cm from the lamp. Calculate the hight of the shadow

Slide 11 - Diapositive

Calculation:
N = distance shadow/ distance object
     = 180/60 
     = 3 

 shadow = 16 x 3 
                     = 48 cm

Slide 12 - Diapositive

Question 29 (p. 27)
timer
3:00

Slide 13 - Diapositive

Do the following questions:
25, 28, 30, 31 (p. 27)
In your writingbook
Rules: 
- 10 minutes
- No talking

Finished early: also do 24, 26, 27
timer
10:00

Slide 14 - Diapositive

How to write a scientific report
Start with a titel
Names of group members (and surnames), class, date, name of teacher
  1. Introduction
  2. Theory
  3. Method of measurements
  4. Results of measurements
  5. Calculations
  6. Conclusion and recommendations.

Slide 15 - Diapositive

General remarks
  • You may not make spelling errors.
  • Do the chapters seperatly, and use bold, cursive, underline and colours to clear things up. 
  • Formulas must be written in their own line, and get a number. 
  • Dont write in the we/ I form
  • Number the figures, graphs and photo's. 
  • Write your report in word and make tables and graphs in excel. 
  • Hand in your assignment with google classroom. 

Slide 16 - Diapositive

Introduction
Explain what you are going to do and why.

DONT WRITE 'I am doing this because the teacher said I must do it'. 

Slide 17 - Diapositive

Theory
  • You make a summary of the theory before you come to the class to do the practical.
  • Explain all the relevant theory here.

Slide 18 - Diapositive

Method of measurements
Answer the questions:
  • How and with what did you take your measurements?

Also insert a picture of your setup (tip: take the picture before you do anything else) and explain what is in the picture. 

Slide 19 - Diapositive

Results of measurements
In this section you write up the resuts you find. 
Tables and graphs you must make in EXCEL. 

Dont include your calculations here. That comes in the next section under calculations. 

Slide 20 - Diapositive

Calculations
Show your calculations here. 

If graphs and tables are needed here, ensure that you make these in EXCEL. 

Slide 21 - Diapositive

Conclusion and recommendations
  • Here you will interpret the calculated values. 
  • That means means that you will explain what the results mean, and if it is correct. 
  • Explain why it is correct, or why it is not correct.
  • Also write what you could have done better. 

Slide 22 - Diapositive

In a nutshell:
N=vb
N=VB

Slide 23 - Diapositive