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Ch. 14 Waves and Energy Transfer Milbank High School.

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Presentation transcript:

DO NOW Get out notes and EOC sheet. Pick up review. Reflection and Refraction lab is due Thursday. Computer Practice is due Friday.

PHYSICAL SCIENCE PS39 What are the four parts of a lever system? How is mechanical advantage increased in a lever system?

PHYSICAL SCIENCE PS39 force, lever arm, fulcrum, load MA is gained by moving the fulcrum closer to the load

TEST REVIEW

REVIEW waves need a medium in order to travel. Examples: Sound, water 1. Know the 15 vocabulary words. 2. Recognize that waves carry energy but not matter. 3. Define mechanical waves. waves need a medium in order to travel. Examples: Sound, water

REVIEW 4. Define and recognize transverse and compressional (longitudinal) waves.

REVIEW 5. Compare and contrast transverse and compressional (longitudinal) waves. Transverse Waves Both Types Compressional Waves The wave energy causes matter in the medium to move at right angles to the direction the wave travels. Both are mechanical waves. Both move energy, not matter forward Medium moved forward and backwards along the direction the wave travels.

REVIEW 6. Know the parts of a transverse and a compressional (longitudinal) wave.

REVIEW Define wavelength and frequency and know the units for each.

Wavelength and frequency are inversely proportional. REVIEW 8. Describe the relationship between wavelength and frequency. Wavelength and frequency are inversely proportional.

The higher the amplitude, the more energy a wave has. REVIEW 9. Explain how a wave’s amplitude is related to the wave’s energy. The higher the amplitude, the more energy a wave has.

REVIEW 10. Calculate a wave’s speed, frequency, and/or wavelength v = λf f = 𝒗 λ λ = 𝒗 𝒇 How fast is a wave traveling if it has a wavelength of 6m and a frequency of 24Hz? λ = 6m v = λf = (6m)(24Hz) = 144m/s f = 24Hz v=? Find the frequency of a wave when its speed is 16m/s and its wavelength is 8m. λ = 8m f = 𝒗 λ = 𝟏𝟔𝒎/𝒔 𝟖𝒎 = 2Hz f = ? v= 16m/s

REVIEW 11. Identify the Law of Reflection and know the parts of the diagram explaining it. The Law of Reflection states that the angle of incidence is equal to the angle of reflection on a flat reflecting surface.

REVIEW 12. Recognize what makes waves bend. The bending of the path of a wave as it passes from one material into another material. The refraction occurs at the boundary and is caused by a change in the speed of the light wave upon crossing the boundary.

REVIEW 13. Define refraction and be able to give examples. Examples: “Bent” pencil Mirage Sparkle of a diamond rainbow

REVIEW 13. Define diffraction and be able to give examples. - Diffraction is the bending of a wave around a barrier.

REVIEW 14. Explain how waves combine, be able to give examples, and draw the waves before and after. INTERFERENCE: Sometimes two or more waves may come in contact with each other and overlap to form a new wave. CONSTRUCTIVE INTERFERENCE occurs when two or more waves hit the same point and combine to produce a larger single wave. DESTRUCTIVE INTERFERENCE occurs when two or more waves hit the same point and combine to produce a smaller single wave.

REVIEW Constructive Interference Destructive Interference

TEST FORMAT 18 Multiple Choice 7 True and False 2 Speed, frequency, and wavelength calculations Short answer questions Drawings (transverse wave, reflection, refraction, interference) The first two are on a bubble-in sheet

FLIP GRID - WAVES

FLIP GRID - WAVES

TO DO Do your Flipgrid video with your current lab partner – due by Friday. Work on test review – due tomorrow for test redo credit. Work on the Reflections/Refraction lab – due by Thursday. Work on Computer Simulations – due by Friday.