Brownian Motion

1. BROWNIAN MOTION
Physics  Module 3 Unit 2  Lesson 1o
Image Source - http://en.m.wikipedia.org/wiki/Brownian_motion

2. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Introduction
• What does the kinetic theory state about
matter?
• What effect does an increase in thermal energy
have on kinetic energy of particles.
• Go to introductory activity on the next slide.

3. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Introductory Activity 10.1
1. Form into groups no more than four(4)
students.
2. Materials: microscope (100-400x), dirt, water
3. Procedure:
• Mix dirt in some water.
• Allow to settle for approximately 8 min.
• Observe water surface with a microscope
(100-400x).
• Click the next button for questions on activity.

4. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Activity 10.1 – Question 1
Question 1:What did you observe?
Type your answers in the box and then click CHECK to see
possible answers.
Tiny particles moving all over the place when they are
hitting larger particles.
CHECK
NEXT QUESTIONNEXT QUESTION

5. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Activity 10.1 – Question 2
How would you describe the motion of the
smaller particles?
Random or haphazard. That is the motion of
the particles is unpredictable.
CHECK
NEXT QUESTIONNEXT QUESTION

6. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Activity 10.1 – Question 3
Which particle is larger, water or dirt?
Water particlesCHECK
NEXT QUESTIONNEXT QUESTION

7. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Activity 10.1 – Question 4
Which particle is moving with the greater energy?
Dirt particles
CHECK
NEXT QUESTIONNEXT QUESTION

8. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Activity 10.1 – Question 5
What conclusion can you make?
Smaller dirt particles with greater energy are
hitting against larger water particles.
CHECK
NEXT QUESTIONNEXT QUESTION

9. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Activity 10.1 – Question 6
What change would be observed if thermal
energy was added?
The tiny dirt particles would be colliding with
larger water particles with greater frequency.
CHECK
END OF ACTIVITYEND OF ACTIVITY

10. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Objectives
As a result of this lesson, the student will be able
to:
1.describe Brownian motion.
2.observe Brownian motion under a microscope,
and explain what causes it.
3.perform activities which relate to Brownian
movement.
4.use the kinetic theory to explain Brownian
motion.

11. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
What is Brownian Motion?
Brownian motion describes :
The random movement of tiny microscopic
particles suspended in a liquid or gas, caused
by collisions between these particles and the
molecules of a liquid or gas.
The random movement of tiny microscopic
particles suspended in a liquid or gas, caused
by collisions between these particles and the
molecules of a liquid or gas.

12. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Description of Brownian motion
• When observing pollen grains under a
microscope, Robert Brown a Scottish biologist
noticed that the pollen grains which were
suspended in water were moving in a random
haphazard way.
• Brown theorized that the molecules of water
were colliding with the pollen grains. Random
movement of the pollen grains was known as
Brownian motion.

13. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Description of Brownian motion (cont.)
• The same effect was noticed when smoke was
passed in a glass cell with air.
• Bright specks were observed to be moving jerky
under a microscope.This implied that the
smoke particles were bombarded against air
particles which changed its direction
continuously.

14. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Demonstrating Brownian motion
Robert Brown, a Scottish biologist placed pollen
grains in water and viewed it under a microscope.
Click HERE to see view under microscope.

15. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
http://weelookang.blogspot.com/2010/06/ejs-open-source-brownian-motion-gas.html
Demonstrating Brownian motion
View under microscope

16. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Deductions
1. Smoke is made up of particles
2. Since specks (smoke particles) are moving it
implies that they are continuously hitting
against some other particle (water).
3. Jerky movement is as a result of smoke
particles hitting against invisible air particles.
4. Temperature increase results in an increased
rate of bombardment. (link kinetic theory to
this)

17. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Activity 10.2
View activity at
-http://www.kscience.co.uk/animations/brownian
.swf and then answer the following questions.
1.Describe the motion of the different particles in
the video.
2.Add heat to the particles and state your
observations.
3.Remove heat from the particles and state your
observations.
4.What effect does temperature have on
Brownian motion of particles?

18. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Activity 10.2 – Question 1
Describe the motion of the different particles in
the video.
The single light coloured particle is seen moving
in a haphazard way.
CHECK

19. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Activity 10.2 – Question 2
Add heat to the particles and state your
observations.
All the particles started to move faster.
The single light coloured particle started to hit
darker particles more frequently and increases
its haphazard movement.CHECK

20. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Activity 10.2 – Question 3
Remove heat from the particles and state your
observations.
All the particles started to move slower. The
single light coloured particle started to hit darker
particles less frequently and decreases its
haphazard movement.
CHECK

21. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Activity 10.2 – Question 4
What effect does temperature have on Brownian
motion of particles?
The greater the temperature the greater the
effect of Brownian motion
CHECK

22. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XXThe following is a metaphor for Brownian
Motion.
Consider a bread crumb which is 1/2 centimeter
wide. Imagine this bread crumb on a sea of
soldier ants in an ant nest. Because the ants are
so excited, they are all trying to crab the bread
crumbs.
•Describe how the different parts of the story
relate to the experiment by Robert Brown.
•Go to the short QUIZ on the next slide.

23. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
QUIZ
• Are you ready to test yourself?
• There are three multiple choice items and one
free response that you are required to do in
relation to the Brownian motion metaphor.
• For each multiple choice item, click on the letter
of the correct response and then click the
button ‘NEXT QUESTION’ to continue. For the
free response item, click CHECK your answer.
• Click the START QUIZ button to begin.
23
START QUIZ!

24. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
QUIZ: Question 1
What does the bread crumb represent?
24
A. Water molecules
B. Pollen grains
C. A pollen grain
FEEDBACK

25. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Quiz: Feedback to Question 1
What does the bread crumb represent?
25
NEXT QUESTION
The bread crumb moving reflects a pollen
grain hitting against water molecules.

26. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
QUIZ: Question 2
What does the colony of ants represent?
26
A. a water molecule
C. a pollen grain
B. water molecules
FEEDBACK

27. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Quiz: Feedback to Question 2
What does the colony of ants represent?
27
NEXT QUESTIONNEXT QUESTION
The ants represents the invisible water
molecules on which the pollen grains would be
bombarding against.

28. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
QUIZ: Question 3
What does the Ant nest represent?
28
A. A container
B. Water molecules
C. The water container
FEEDBACK

29. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Quiz: Feedback to Question 3
What does the Ant nest represent?
29
NEXT QUESTIONNEXT QUESTION
The ant nest would represent the container
which holds the water and pollen grain when
they are being viewed through the microscope.

30. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
Quiz: Question 4
Describe the motion of the bread crumb as the
ants crab in excitement.
Each ant should be fighting to carry the bread
crumb. The bread crumb therefore would not be
moving in a fixed order in the nest. The crumb
would be moving in a random/haphazard way.
CHECK
Type your answer in the box and then click CHECK to see possible answer.

31. OBJECTIVES
WHAT IS BROWNIAN
MOTION?
DISCOVERY OF
BROWNIAN MOTION
OBSERVING
BROWNIAN MOTOIN
DEDUCTIONS FROM
BROWNIAN MOTION
BROWNIAN MOTION
METAPHOR
INTRODUCTION
QUIZ
XX
End of Quiz
• You have reached the end of the quiz.
• If you wish to review this lesson, go to the first
slide.
• If you have finished viewing the lesson, click the
Close (X) button.
31