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Name tags – first few class Morning New chart each chapter

Name tags – first few class Morning New chart each chapter. Table 12 TAs. 12. 7. 13. 11. 8. 9. 10. Day 1. Name tags – first few class Afternoon New chart each chapter. Table 12 TAs. 12. 7. 13. 11. 8. 9. 10.

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Name tags – first few class Morning New chart each chapter

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  1. Name tags – first few class Morning New chart each chapter Table 12 TAs 12 7 13 11 8 9 10 Day 1

  2. Name tags – first few class Afternoon New chart each chapter Table 12 TAs 12 7 13 11 8 9 10 Day 1

  3. Steve Brehmer Wanamingo High School: 1976 – 1988 physics, chemistry, ecology, computer programming 9th grade science, information processing Mayo High School: 1988 – 2009 (retired) honors physics, A.P. physics Bakken Museum: 2009-2010 instructor University of Minnesota: 2010 – present Teacher in Residence

  4. Course Webpage - www.physics.umn.edu , Courses, 3071.001 & 3071W.002 Practice tests Messages – news Syllabus Structure of the PET course PET curriculum Structure of the PET activates Book Grading Criteria Grading Scale Homework PET simulator – http://cpucis.sdsu.edu/petisms Children’s Ideas - http://www.petpset.net Exams Writing Assignments Learning Commentary Physics Ideas Attendance Read it all!

  5. Icebreaker Name Favorite Snack Hometown Best subject, skill, or interesting personal fact Introduce your neighbor to the class Teaching Assistants Jennifer Hanson Noelle Treweek Chaska Taylor Emily Blessinger Snack Sign-up FCI Test – Force Concept Inventory (about 40 min) Take a break when you are finished

  6. The first person to arrive from your table should log in as soon as they get to class each day Troubleshooting Motion Detector: You can not log on if you see orange Class Applications/Motion Sensor Files Simulations: Foxfire menu bar/PETsims Whiteboard: Foxfire menu bar/Scriblink Each table in the afternoon section should log off the computer at the end of the day and put it away.

  7. http://www1.iclicker.com/register-clicker/ Write down your clicker number – use the same one each time.

  8. In high school, what type of physics class did you take? • I haven’t taken physics • Regular physics • Honors physics • AP or IB physics • PSO physics • How do you feel about science classes in general? • I love to learn about science • Science is okay – not my first love • I don’t find science very interesting • Hate it • What grade do you expect to get in this class? • A • B • C • D • F

  9. What was good about science classes you have taken? Open Scriblink from the menubar What would you change about science classes you have taken?

  10. Activity 1 • How do you represent motion? • How do you use a motion sensor? • Activity 1 Homework: Part 1 & 2 • Due next time – Sept. 8 Motion Detector: Motion Sensor File C1A1

  11. Constant Velocity Speeding up Speed Time

  12. Ultrasonic motion detectors • 1 Hz = 1 vibration/second • The human ear hears between 20 - 20,000 Hz • Bat – 120,000 Hz • Motion Detector – 40,000 Hz • Medical Ultrasound – 1000000000 Hz = 1X109 Hz • Speed of Sound = 343 m/s or 768 mph • Time = distance/speed • or distance = speed X time • About how long does it take sound to travel 2 m? 2 m / 343 m/s = .058 sec

  13. If you wish to store a graph: Experiment/Store Latest Run If you wish to delete all graphs: Data/Clear All Data If you wish to extend the time that data is collected: Experiment/Data Collection… Change time Click “Done” Hint: Write these commands on the inside of your book cover. after step 3

  14. Watch the motion of the two carts. 1. Which graph best represents the motion of the two carts? A B C D Speed Speed Speed Speed Time Time Time Time Day 2

  15. A B C D 2. Which object is traveling at a constant speed? 3. Which object ends its trip going the fastest? 4. Which object ends its trip at rest.

  16. Create a track

  17. Sketch a speed vs. time graph for this track. • Which ball reaches the bottom first? • A. The ball on the maroon track. • B. The ball on the gold track. • C. They reach the bottom at the same time. speed time

  18. U of M: High Road, Low Road Use Scriblink – Why does the maroon ball win – expain in words and graphs

  19. The motion detector • Works best if you are at least 20 cm away. • Works by timing an ultrasonic sound pulse to calculate distance. • Calculates speed using distance and time measurements. • All of the above. • Just A and C. A. Observation B. Prediction C. Model D. Inference Not a guess about what might happen, but a statement about what might happen supported by reasons drawn from prior experience or from general ideas about how the world works. A set of general ideas that explain how a part of the world works. Not what you think is happening but only what you actually see happening What you think is happening based on your general ideas and what you see • The amount of kinetic energy you posses is best associated with • Your position above the ground. • Your speed. • The amount of force acting on you. • Your temperature. • The amount of breakfast you ate this morning

  20. Activity 2 • When does kinetic energy change? • Does Kinetic Energy change on its own? • Activity 2 Homework • Due next time – 9/10

  21. Page 1-26

  22. Interaction Type: Contact Interaction – a push or a pull between objects in contact. Energy Category : Mechanical – At least one object changes speed. Energy Type: Kinetic energy – the energy of motion Potential energy – stored energy Chemical potential energy – energy stored in chemical bonds P 1-32

  23. Interaction Type Energy Source Energy Receiver Energy category transferred Object receiving energy Object providing energy How specific energy types changed for the source How specific energy types changed for the receiver P 1-32

  24. S/R Diagram A moving cart collides with a cart that is standing still. Contact Interaction Energy Source Energy Receiver Mechanical Energy Launched Cart Target Cart Decrease in Kinetic Energy Increase in Kinetic Energy KE – motion PE – chemical, elastic, gravitational… Page 1-37 Explanation #1

  25. Scientific Explanations: • Describe the Situation using a diagram • Write the Explanation Narrative • Completeness – all interactions and energy transfers • Accuracy – scientifically correct as discussed in class • Logical Reasoning and Clarity – Makes sense Connects science with result of interaction Proper order

  26. P 1-37 Why did the target cart start to move when the launched cart collided with it? The launched cart is moving toward the target cart and when they collide there is a contact interaction between them. The energy source during the interaction is the launched cart, and there is a mechanical transfer of energy from it to the target cart, which is the energy receiver. Because of this energy transfer, the kinetic energy of the launched cart decreases while the kinetic energy of the target cart increases Because the target cart was initially at rest, this increase in kinetic energy means that it starts to move.

  27. Activity 3 • What energy changes occur in an interaction with a “stretchy” object?

  28. Day 3 Activity 2 HMWK – version 4

  29. Activity 3 Elastic Potential Energy From your observations in this activity does it seem that there is a relationship between the amount a rubber band is stretched the amount of elastic potential energy it has? What evidence do you have?

  30. Baseball Golf ball

  31. Interaction Type: Contact Interaction – a push or a pull between objects in contact. Energy Category : Mechanical – At least one object changes speed. Energy Types: Kinetic energy – the energy of motion Potential energy – stored energy Chemical potential energy – energy stored in chemical bonds Elastic potential energy – energy stored in a stretched or compressed object.

  32. Activity 4 • All objects, if left alone, seem to eventually slow down and stop. Why? • Activity 4 HMWK – due 9/15

  33. Slip and Side 1

  34. Interaction Type: Contact Interaction – a push or a pull between objects in contact. Energy Category : Mechanical – At least one object changes speed. Energy Types: Kinetic energy – the energy of motion Potential energy – stored energy Chemical potential energy – energy stored in chemical bonds Elastic potential energy – energy stored in a stretched or compressed object. Thermal Energy – changes the temperature of an object

  35. t=0 D0 = 0 m D = 0 m V0 = 5 m/s ∆t = 1 s Draw cart at D Computer Memory t = t+1 D = D0 + V0 ∆t Draw cart at D D0 = D End t = 5?

  36. Slip and Slide II

  37. Graph 1 Graph 2 A B D E A B E F C D C Day 4 • Which graph best represents a tennis ball bouncing off a wall? • (A) Graph 1 (B) Graph 2 (C) Both graphs (D) Neither graphs • Which graph best represents a car at a stop light? • (A) Graph 1 (B) Graph 2 (C) Both graphs (D) Neither graphs Speed Speed • 3. During which interval is the ball in contact with the wall? • (A) A to B (B) A to C (C) B to C (D) B to D (E) A to E Time Time • 4. Where did the kinetic energy of the ball go when it is at C on the graph? • Chemical Pot. Erg. (B) Elastic Pot. Erg. (C) Thermal Erg. (D) Disappears 5. Where did the kinetic energy of the car go when it is at on the graph C? (A) Chemical Pot. Erg. (B) Elastic Pot. Erg. (C) Thermal Erg. (D) Disappears • 6. Where is a contact interaction happening for the car on graph 2? • B to C, D to E (B) (C) A to B, C to D, E to F . (D) A to F (E) B to E

  38. The Thermos Bottle 4 air & not silvered 1 vacuum & silvered 2 air & silvered 3 vacuum & not silvered 7. At the end of the period, what will be the order from warmest to coolest. (A) 1, 2, 3, 4 (B) 4, 3, 2, 1 (C) 1, 3, 2, 4 (D) 4, 2, 3, 1 (E) They will all be the same temperature.

  39. Activity 5 • What types of interactions change the temperature of objects? • Fix diagram on page 1-78 • Activity 5 HMWK – due 9/17 • Thermos Narrative • Fix diagram – page 1-86, 1-89 • Page 90 – negligible / non negligible

  40. Conductivity Copper – Cu Nickel – Ni Stainless Steel – SS Brass – Cu and Zn Aluminum – Al Which would fall off before Cu? (A) Lead (B) Aluminum (C) Silver (D) Window glass

  41. Low E materials: Are poor radiators of heat. Are good reflectors of IR radiation.

  42. Friction – Block and Table Rubbing Hands Hot Water in Beaker

  43. Which surface gives off infrared light the best? • Shinny metal • (B) Dull metal • (C) White paint • (D) Black paint • All sides receive heat from the light bulb at the same rate. Leslie’s Cube

  44. Convection

  45. Page 5-39

  46. Page 5-40

  47. Heat Transfer • Conduction • Convection • Radiation Which method of heat flow is most responsible for the following. • Burning yourself when you touch the handle of a frying pan. • Heat energy traveling from the sun to the earth? • You find it is warmer at the ceiling then the floor?

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