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Warm-up

Warm-up. Be ready for class, pick up the waves reflection sheet. Put your name on it. Our next unit is Catch a Wave, on the back of your reflection sheet… Predict: What is a wave? Read the global connection and list some ways that you are or could be affected by waves everyday. Warm-up.

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Warm-up

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  1. Warm-up • Be ready for class, pick up the waves reflection sheet. Put your name on it. • Our next unit is Catch a Wave, on the back of your reflection sheet… • Predict: What is a wave? Read the global connection and list some ways that you are or could be affected by waves everyday.

  2. Warm-up • Review your matter assessment and write down any questions you have and which learning objective you scored the highest on.

  3. Warm-up • Pick up your waves pre-test. Finish creating your bars for each objective and list your score and 3 things to be successful. • Also look at your prediction of what a wave is from yesterday.

  4. WARM-UP • If you are afraid you will lose your waves booklet put it in the tray for your class (you will have the whole class period tomorrow to complete). • The character trait for this week is humility. What does humility mean? Was humility one of your top traits (from the survey last week on Tuesday). • CHALLENGE for the day-Try not to brag about yourself and do at least one thing to build up someone else.

  5. Warm-up • Be ready for class, quiet and in your seat. • List today’s date above your warm-up. • Write the essential questions and the standard for the unit from the board. If you have time copy the global connection. • Can you answer any of the questions? • Today you will complete a notes handout over Brainpop that you can use as a study tool.

  6. Warm-up • Be ready for class, no talking when the bell rings. • Pick up the notes handout from the front table and put your name on it. • Fill in the first sentence…What is a wave? (use your flash cards or vocabulary handout).

  7. WARM-UP • What is the main difference between an electromagnetic and a mechanical wave (use your notes)? • Keep your notes out and be ready to finish them today.

  8. Warm-up • PICK up the notes handout. • What is a wave? • What do waves transfer? • What are the two types of waves?

  9. Warm-up • What is a wave? Any disturbance that transfers energy • What do waves transfer? Energy • What are the two types of waves? Transverse and longitudinal or electromagnetic/ mechanical

  10. Warm-up • Take out your waves booklet and continue working (15minutes of work time). What you do not finish must be complete at the beginning of class tomorrow. • When you finish…Pick up a Bill Nye Question sheet from the front table.

  11. Warm-up Describe the differences between reflection, refraction and diffraction. Give an example of each.

  12. Warm-up • Open your textbook to the page needed (from your rubric) • Take out your waves booklet. Continue to work and raise your hand if you need help, only whispering with your table partner while you work. • Do not leave your seat w/o my permission, if you are finished ask me for the next assignment.

  13. Warm-up • Be ready for class, have a pencil, your wave notes and your booklet out. • Look over notes-today you will complete the open notes waves assessment, remember the equation for wave speed is multiplication. • When finished complete any work from Friday & then preview the sound chapter in the textbook (section C) page C35-C65.

  14. Goal for this unit: • Explain that earthquakes, light and sound are all types of waves with unique properties and that there are differences and similarities between electromagnetic and mechanical waves. • Pre-knowledge Level: ?/39 •  Please write three actions you plan to do to be successful in this unit: Ask for help when needed, review notes and handouts on a regular basis, focus in class.

  15. The Energy of Waves Learning Goals: Describe how waves transfer energy. Describe the difference between transverse & longitudinal waves. Describe the properties of amplitude, wavelength, and frequency. Compare the properties of waves to the wavelike property of energy in earthquakes, light, and sound. Describe how waves interact through reflection, refraction, diffraction.

  16. Essential questions • What is a wave? • What is a medium? • What is the difference between a longitudinal and transverse wave? • What are the properties of a wave? • What behaviors do all waves have in common? • What is the difference between reflection, refraction, and diffraction?

  17. Nature of Waves matter • Wave—any disturbance (movement) that transfers energy through _______ or empty ________. • Waves move energy by ____________ __________in a medium. • Medium—a substance a wave can travel through; it can be__________________. • Characteristics of Waves: Sound waves • http://www.youtube.com/watch?v=8i6hTU0jw-g space vibrating particles solid, liquid, or gas

  18. Waves that do NOT need a medium are called _________ __________ ___ Examples: _______ ______ Microwaves x-rays T.V. & radio waves Waves that need a medium to move are called _________ ______________Examples: _____________ _____________ Seismic waves (earthquakes) Nature of Waves electromagnetic waves mechanical waves Sound waves Visible light Ocean waves http://www.youtube.com/watch?v=7yP a8qi5X8 ocean wave animation

  19. Types of waves energy • All waves transfer ________ by repeated _______________. • _______________waves—particles vibrate in an ________________motion while the energy moves across. vibrations Transverse up-and-down Particles Energy http://www.youtube.com/watch?v=TZIr9mpERbU&NR=1 rope example http://www.youtube.com/watch?v=g49mahYeNgc slow motion

  20. Longitudinal • ___________wave—the particles of the medium vibrate back and forth in the same direction the wave energy is moving. • ____________—part of a longitudinal wave where the particles are crowded (pressed) together. RAREFACTION: The part where the particles are spread apart. Compression Particles & Energy

  21. Wave animations • http://www.youtube.com/watch?v=7cDAYFTXq3E • http://www.youtube.com/watch?v=JsJOug4SqL8

  22. Properties of waves • Amplitude—(wave height) distance from the rest position to the crest or trough • Large amplitude=more energy crest rest position trough

  23. Wavelength—thedistance from any point on a wave to an identical point on the next wave. (crest to crest, trough to trough, compression to compression, rarefaction to rarefaction)Shorter wavelength=higher frequency

  24. waves second Hertz • Frequency—the number of _________ passing through an area in one _______, measured in _______ (Hz) 1 Hertz = 1 wave per second 5 waves in 1 second= 5 Hz Higher frequency= higher energy Wave speed— speed at which a wave travels =frequency x wavelength Low frequency-few waves Per second Higher frequency—more Waves per second 1 second

  25. Wave property animations • Wave motion: change frequency, wavelength etc…http://profhorn.aos.wisc.edu/wxwise/kinematics/wavemotion.html • Characteristics of Waves: Amplitude, Wavelength and Frequency http://www.youtube.com/watch?v=aif5mxf5DtU

  26. Wave Interactions Reflection bounces back • ___________—when a wave _______ __ _ _ _____after hitting a barrier it can’t go through. All types of waves can be reflected Example: ______ —a reflected sound wave, sonar echo Light waves reflected off an object allow you to see it. surface

  27. Refraction bending • _________—the ________ of light waves as they pass through from one medium to another at an angle. • When a wave passes from one medium to another, it’s speed and wavelength changes so it _________. • Examples: • White light bends to form a rainbow bends

  28. Diffraction • _________—the change in direction of a wave as it bends around a barrier or opening • Resonance—when two objects vibrate at the same frequency; one object causes _____________________. • http://www.acoustics.salford.ac.uk/schools/teacher/lesson3/flash/whiteboardcomplete.swf another object to vibrate interactive wave disturbance tutorial

  29. A resonating object absorbs energy from the vibrating object and begins to vibrate too. • The 4 month old bridge collapsed during a windstorm with gusts that reached 68 km/h (42 mph). The catastrophe was attributed to faulty design. Instead of allowing the wind to pass through, the suspended girders caught the wind, causing the bridge to buck and roll. The bucking motion earned the bridge the nickname Galloping Gertie. The stronger the wind blew, the more violently the structure oscillated, until it finally broke apart and crashed into the water. • http://www.youtube.com/watch?v=CsKKDLKYsVU • http://www.wsdot.wa.gov/tnbhistory/connections/connections3.htm

  30. Label the wave parts 1 second 0 seconds Type of wave: Longitudinal Frequency: ____ Hertz 3 wavelength __________ amplitude Type of wave: Transverse Frequency: ____ Hertz __________ 3.5 wavelength ___________

  31. Waves Transverse Longitudinal Energy Medium Frequency Amplitude Wave speed DRAW THIS CHART IN YOUR NOTEBOOK http://sci-culture.com/advancedpoll/GCSE/sine%20wave%20simulator.html wave simulator

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