Physics M3 Brownian Motion

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Transcript of Physics M3 Brownian Motion

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