Why does your debit card have a black strip on the back SLC today EampM Quiz 10 questions 3 MC 6 written 1 drawing Scientists Electromagnetic Induction Electromotive force Magnetic field lines ID: 1025291
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1. BellringerWhat is electromagnetic induction and who explained it?Why does your debit card have a black strip on the back?
2. SLC todayE&M Quiz10 questions3 MC, 6 written, 1 drawingScientistsElectromagnetic Induction, Electromotive forceMagnetic field linesElectric motors/generatorsTransformers, solenoids, railgun, speakers, etc.Updates
3. Introduction to WavesSurf’s up dude!
4. ObjectivesLearn the basic characteristics of waves and use them to solve simple problems.
5. What Are Waves?A wave is a disturbance that carries energy through matter or space without transferring matter. Wave Demo
6. Ocean Waves
7. Wave Characteristics Amplitude: The greatest distance from equilibrium.The bigger the amplitude of the wave, the more energy the wave has.
8. Wave Characteristics Crest: The top point of a wave.Trough: The bottom point of a wave.
9. Wave CharacteristicsWavelength: The shortest distance between points where the wave pattern repeats itself.Wavelength is measured in meters, the symbol is
10. Wave CharacteristicsPhase: Any two points on a wave that are one or more whole wavelengths apart are said to be “in phase”.
11. Wave CharacteristicsFrequency: Is the number of complete oscillations a point on that wave makes each second.Frequency is measured in Hertz (Hz), its units are
12. Wave Characteristics Speed: The speed or velocity of a wave is how fast the energy is moved. For most waves, wave speed does not depend on amplitude, frequency, or wavelength. Speed depends only on the medium through which it moves.
13. Wave CharacteristicsPeriod: The time it takes a wave to go through one cycle, or the time it takes a point to go through one phase of the wave.The period of a wave is measured in seconds, and it’s symbol is “T”.
14. ExampleWhat is the velocity of a wave that has a frequency of 250Hz and a wavelength of 1.5m?
15. CheckpointHow does the speed of a wave change if the amplitude is increased?The speed doesn’t change.What is the velocity of a wave that has a frequency of 100Hz and a wavelength of 2.0m?
16. Practice On page 393 of the textbook answer questions 15, 16, 17, 19, 22, and 24.
17. Answers15. 343m/s, 2.29x10^-3s, 0.787m16. You should shake it at a lower frequency because wavelength varies inversely with frequency.17. 2.45m/s19. 2.50m22. The frequency is one-half of its original value.24. The wavelength increases to 1.5 times its original value.
18. Bellringer What does a wave transfer?Energy, NOT MASS!DO WORK STOP
19. ObjectivesReview and solidify the material you learned and practiced yesterday.Learn about the different types of waves.Study, create, and destroy different wave types.
20. Practice On page 393 of the textbook answer questions 15, 16, 17, 19, 22, and 24.
21. Answers15. 343m/s, 2.29x10^-3s, 0.787m16. You should shake it at a lower frequency because wavelength varies inversely with frequency.17. 2.45m/s19. 2.50m22. The frequency is one-half of its original value.24. The wavelength increases to 1.5 times its original value.
22. Art Time – Example Part TwoDraw two more cycles of the red wave.
23. Art Time – Example Part TwoDraw one more cycles of the blue wave.
24. Art Time – Example Part TwoWhat is the wavelength of the red wave?2.0m
25. Art Time – Example Part TwoWhat is the wavelength of the blue wave?4.0m
26. Art Time – Example Part TwoWhat is the amplitude of the red wave?0.5m
27. Art Time – Example Part TwoWhat is the amplitude of the blue wave?0.25m
28. Art Time – Example Part TwoIf this is a snapshot of how far each wave traveled in 1 second, what is the frequency of the red wave?3.0Hz
29. Art Time – Example Part TwoIf this is a snapshot of how far each wave traveled in 1 second, what is the frequency of the blue wave?1.5Hz
30. Art Time – Example Part TwoAre the red and blue wave in phase with each other?Nope
31. Art Time – Example Part TwoMark two spots on each wave that are in phase with each other.
32. You tryDraw the following waves on the same graph:A wave with an amplitude of 6m and a wavelength of 3m.A wave with an amplitude of 2m and a wavelength of 2m.A wave with an amplitude of 3m and a wavelength of 4m.Which wave has the greatest frequency if they’re all traveling at the same speed?
33. Types of WavesThere are two types of waves!Transverse Waves: A wave that disturbs the particles in the medium perpendicular to the direction of the wave’s travel.Longitudinal Waves: A wave that disturbs the particles in the medium parallel to the direction of the wave’s travel.
34. Transverse vs. Longitudinal Waves
35. CheckpointWhat is a Transverse wave?What is a Longitudinal wave?
36. Slinky DemoHow can a single transverse wave pulse be produced using a slinky?How can a single longitudinal wave pulse be produced using a slinky?Sound waves are longitudinal waves because they shake the air as they transfer the energy to our ears.
37. https://www.youtube.com/watch?v=XFF2ECZ8m1AMust Watch Television
38. Bellringer What is the speed of a radio wave that has wavelength of 1,396m and a frequency of 214,899.7135Hz? DO WORK STOP
39. ObjectivesLearn about the different types of waves.Study, create, and destroy different wave types.
40. Grade UpdateAnswer these questions.How did you follow your plan on how to improve your grade? Are you happy with your grade and what do you want your grade to be by the end of the quarter?What are you going to do to improve your grade?
41. Waves at BoundariesWhat does the surface of water look like when you drop a small rock in a calm bucket of water?What happens when the wave hits the walls?Splash Demo!!! Get your goggles!
42.
43. Waves at Boundaries Recall that a wave’s speed depends on the medium it passes through:Water depthAir temperatureTension, and massA “Boundary” is when a wave goes from one medium to another.
44. Waves at BoundariesThere are three ways you’ll be interested in at boundaries.Incident Wave: A wave pulse that strikes the boundary.Reflected Wave: A wave that bounces backwards after hitting the boundary.Transmitted Wave: A wave that continue forward after hitting the boundary.
45. Waves at Boundaries
46. Waves at Boundaries DemosDifferent Medium Demo:The incident energy is split between reflected and transmitted energy.Rigid Boundaries Demo:All of the incident energy is turned into reflected energy.
47. CheckpointHow does the amplitude (energy) of a wave change when it hits a rigid boundary like a wall?How is the conservation of energy observable with a single wave hitting a different medium?
48. Waves in a BucketWhat happens if you drop two rocks into a calm bucket of water instead of just one?Splash Demo 2.0!!! Get dem goggles back! The waves seem to hit each other, but then just continue on their way…weird?
49.
50. Wave InterferenceWhen we had two particles (carts) and pushed them into each other they collided and then stopped. When waves collide they temporarily interfere with one another, but they do not stop each other.
51. Wave InterferenceThe Principle of Superposition states that the displacement of a medium caused by two or more waves is the algebraic sum of the displacements caused by the individual waves.
52. Superposition (Interference)
53. Now a super superposition demo!Can we make two waves create a bigger wave?Can we make two wave create a smaller wave?Is there a limit to how many waves we can create?
54. Bellringer What is the speed of a radio wave that has wavelength of 1,396m and a frequency of 214,899.7135Hz? DO WORK STOP
55. ObjectivesLearn about the different types of interference, practice solving problems that deal with it, and demonstrate the different interference patterns with a small group.
56. Limit to waves?The number of waves that are interfering with each other is limitless.Each wave is just a form of a sine wave.Wolfram Alpha Demo:https://www.wolframalpha.com/input/?i=sinx+
57. Types of Interference There are three types of interferenceConstructive Interference: When the crest of a wave meets a crest of another wave of the same frequency at the same point.Destructive Interference: When the crest of a wave meets a trough of another wave of the same frequency at the same point.Different Amplitude: All other scenarios of waves interference.
58. Constructive vs. DestructiveWhich is constructive and which is destructive interference? How do you know?
59. Interference PracticeIf waves A and B were aligned on top of each other, what would the resultant wave look like?
60. Interference PracticeIf waves A and B were aligned on top of each other, what would the resultant wave look like?
61. Interference PracticeWhat does the wave look like under the block?
62. Can you do this?Let’s see if we can successfully make waves both constructively and destructively interfere!Note: not all the slinkies are in the best shape, but remember this is not an open invitation to make them worse!
63. Can you do this?Try to complete these 5 missions. Try to take video or pictures with your phone to capture the interference. Make two transverse waves constructively interfere.Make two longitudinal waves constructively interfere.Make two transverse waves destructively interfere.Make two longitudinal wave destructively interfere.Play around with different amplitudes, can you get three waves to interfere?
64. Bellringer Draw a picture of two waves moving towards each other that will constructively interfere once their crests meet.DO WORK STOP
65. ObjectiveLearn and be able to identify standing waves and their properties.
66. Results? – Where are they?What were you able to find?E-mail me your successful results!KVerspoor@windsor-csd.orgWere there any trials that didn’t work?
67. Grade Update - LabsAnswer these questions.How did you follow your plan on how to improve your grade? Are you happy with your grade and what do you want your grade to be by the end of the quarter?What are you going to do to improve your grade?
68. HomeworkRead pages 394 to 397.Stop before reading “Waves in Two Dimensions” on page 397Very good illustrations and snapshots of superposition and interference.
69. Standing WavesWhen a wave appears to just move up and down instead of transmitting energy side to side it is called a standing wave.These waves appear to be standing still, hence “Standing Wave”.
70. Standing Wave DemoWhat happens to the number of bumps as I increase the frequency? Why?How does the wavelength change has I increase the frequency?How does the speed of the waves change as I increase the frequency?
71. Standing WavesWhy must I keep oscillate my arm to generate a standing wave?A standing wave is made up interfering waves moving in opposite directions. Without this small input the wave would die out.
72. Standing WavesResonance is when a small energy input frequency is continually applied to an object and it causes the object to oscillate with greater and greater amplitude.Resonance is continual constructive interference.Every object has a resonance frequency.Swing-sets use resonance.Microwave ovens are the resonance frequency of water.Tesla found the resonance frequency of the Earth.
73. Tacoma Narrows Bridgehttps://www.youtube.com/watch?v=xox9BVSu7OkThe designer took Tacoma’s money and said he brought and insurance policy for the bridge…he didn’tThe bridge started oscillating almost as soon as it was finished.It collapsed just days before the fake insurance policy would have expired.He went to jail.
74. Nodes and AntinodesNodes and Antinodes are used to help describe and understand waves.A “node” is where waves meet and cause zero displacement of the medium.No displacementAn “antinode” is where waves meet and cause the largest displacement of the medium.Anti no displacement
75. Nodes and Antinodes
76. Nodes and Antinodes
77. Practice How many nodes and antinodes does the wave below have?
78. FYIThe mod 8 physics class is smoking the mod 2 physics class…90 to 84!
79. PracticePage 403 numbers 61-63, 67, 71-74, 7617 minutes to complete.Work in pairs or groups of three.Each group can ask me up to three questions.Counts as a grade…homework? Quiz? Lab? Test?
80. AnswersT=8.3s4.0 m/sv=0.288 m/s ; T=0.21sf=550Hz ; 275 waves ; 165mThe reflected wave pulse from a rigid boundary is inverted.
81. AnswersNo displacement or movementBare areas are antinodes, sugar covered areas are nodesA standing wave exists and the string can be touched at any of its five nodesSee drawing.
82. Bellringer – 2 mins to hand inWhat is a standing wave?What is an antinode?What is a node?DO WORK STOP
83. ObjectivesPractice your understanding of waves.Complete “Slinky Lab” to demonstrate you have the power to create and destroy waves.Computer simulator.
84. Slinky LabAll sample calculations must be shown on a separate sheet of paper.All answers to questions must be shown on a separate sheet of paper.All questions must be answered in complete sentences with full explanation.1 tile is 1 meter.
85. Bellringer – 2 mins to turn inTurn it in on the back table and pick up your bellringer from last week as well as your group’s answers from last week.How are standing waves created?DO WORK STOP
86. Standing WavesWhat is a standing wave?How are standing waves created?What is an antinode?What is a node?
87. ObjectivesReview the basics of waves for a quiz tomorrow.
88. LabsPlease pass up your slinky labs
89. Introduction to Waves Quizest?15 multiple questions?3 long answers?1 modTuesday?
90. More DrawingIn the “Intro to Waves HW” packet answer questions 35 (parts 1-3), 35, 36, 37Yes there are two number 35sFor homework finish the packet!
91. Standing Wave SimulatorWhat does a standing longitudinal wave look like?https://phet.colorado.edu/en/simulation/normal-modesFixed end vs. open end. Destructive and Constructive Interferencehttps://phet.colorado.edu/en/simulation/wave-on-a-string
92. What’s on the Quizest?Wave VocabularyDrawing WavesTransverse vs. Longitudinal WavesWave interference and SuperpositionConstructive/DestructiveStanding WavesNodes and Antinodes
93. Bellringer – 2 mins to turn inTurn it in on the back table and pick up your bellringer from last week as well as your group’s answers from last week.If a wave travels at 15m/s and has a wavelength of 2.2m what is its frequency?DO WORK STOP
94. ObjectivesReview the basics of waves for a quiz tomorrow.
95. Intro to Waves HW
96. You be the teacher!You know all the topics that will be on the quizest. Can you use this knowledge to figure out the questions I’ll ask?Write 2 multiple choice questions and 1 long answer question with at least 2 parts.Try to cover as many of those categories as possible.
97. You be the teacher!I’ll collect and redistribute the questions.Find your partner then solve the questions you are given.Then you’ll grade their responses.Who had good questions?
98. Intro to Waves HW Packet
99. Physics teacher wave generatorhttps://www.youtube.com/watch?v=-gr7KmTOrx0