Monday, December 17th -Liquid Demo -Return Energy Summative -Check & Go Over Lab Waves Stations -Check & Go Over Waves HW -Build a Wave Machine

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Monday, December 17th -Liquid Demo -Return Energy Summative -Check & Go Over Lab Waves Stations -Check & Go Over Waves HW -Build a Wave Machine -HW Work Time HW = Read pages 694-700 and answer #s 1,3

1 Monday, December 17th -Liquid Demo -Return Energy Summative -Check & Go Over Lab Waves Stations -Check & Go Over Waves HW -Build a Wave Machine -HW Work Time HW = Read pages and answer #s 1,3 & 4 Read pages answer #s 1-5 Liquid Demo Do you notice a variation in sound when sound waves travel through different materials? What properties of materials cause the sound waves to produce a different sound? Substance Pitch Stop/Continue 1. List the materials in the beaker in order of increasing density. 2. How does the pitch of the sound change as density of the material in the beaker increases? 3. How does the density of the material in the beaker affect how long the sound continues to be heard after the beaker is tapped?

2 Energy Summative Re-Take Contract Name: Core: 1. I have complete corrections and reviewed them with Mrs. Harmon Student Teacher 2. I have spent additional time preparing and have evidence Student Teacher 3. I have arranged a re-take time with Mrs. Harmon that is BEFORE 3 PM on Friday 12/21. Student Teacher Lab Waves Stations higher # creates a higher pitch the tines vibrate and they disturb the surrounding air molecules which cause vibrations and alternating patterns of high and low pressure music - accurate pitch, tuning instruments watches - accurate time medicine - hearing radar gun - calibration

3 circular YES YES NO 1. increases 2. longer wavelength 3. collide and produce more waves 4. reflects the wave 1. increase drip rate, decrease wavelength 2. increase droplet size, decrease wavelength 3. increases the water level with 2 slits 4. reflects the wave 1. speaker vibrates faster, wave is faster, shorter wavelength, sound is higher 2. speaker moves back and fourth more, wave is faster, shorter wavelength, sound is higher 3. more amplitude = more pressure 4. They circle in place

F G A D D Compression waves, particles move parallel Yes, but not back and forth.

arrive 1st Displacement is perpendicular to the wave movement Not along with the

Secondary (s) waves, slower, arrive later both longitudinal and transverse

4 F G A D D Compression waves, particles move parallel Yes, but not back and forth. Oscillate in place (move back and fourth in place) Primary (P) waves, faster, arrive 1st Displacement is perpendicular to the wave movement Not along with the wave, but oscillate up and down in place = yes! Secondary (s) waves, slower, arrive later both longitudinal and transverse clockwise circles both longitudinal and transverse COUNTER - clockwise ellipse Slowest, arrive last, cause most damage Yes

5 CONSTRUCTION TIPS: WHAT CAN IT DO: Build a Wave Machine MATERIALS: tape kabob sticks mass (gumdrops) tape needs to be in tension spacing of kabob sicks should be about 5 cm adjust lopsidedness by adjusting gumdrops 1. show a wave by a single pulse that causes a disturbance 2. create different amplitudes 3. create different wavelengths & frequencies 4. create different speed waves IN THE TABLE BELOW RECORD WHAT YOU DID TO ACCOMPLISH 1-4 ABOVE. ALSO LIST 2 OBSERVATIONS Single pulse that causes a disturbance Different amplitude Different wavelengths & frequencies Different speeds Build a Wave Machine CONSTRUCTION TIPS tape needs to be in tension spacing of kabob sicks should be about 5 cm adjust lopsidedness with gumdrops WHAT CAN IT DO single pulse that causes a disturbance changing the amplitude gumdrops move up and down but not through machine disturbance moves through machine TWIST is moving through tape gumdrops add mass to the system, slowing it down, making it easier to see viewing an energy transfer by viewing the disturbance lift gumdrop higher to begin with *doesn't change speed of wave changing the wavelength & frequency *move gumdrop faster gives a shorter wavelength & a higher frequency *doesn't change speed of wave changing the speed of the wave *change machine *remove gumdrops / use smaller gumdrops

6 HW Work Time Read pages answer #s 1,3 & 4 Read pages answer #s 1-5 Energy Summative Re-Take Contract Name: Core: 1. I have complete corrections and reviewed them with Mrs. Harmon Student Teacher 2. I have spent additional time preparing and have evidence Student Teacher 3. I have arranged a re-take time with Mrs. Harmon that is BEFORE 3 PM on Friday 12/21. Student Teacher Energy Summative Re-Take Contract Name: Core: 1. I have complete corrections and reviewed them with Mrs. Harmon Student Teacher 2. I have spent additional time preparing and have evidence Student Teacher 3. I have arranged a re-take time with Mrs. Harmon that is BEFORE 3 PM on Friday 12/21. Student Teacher

Mechanical Waves. Mechanical waves are created by the vibration of objects. Mechanical waves can be either transverse or longitudinal.

Mechanical Waves. Mechanical waves are created by the vibration of objects. Mechanical waves can be either transverse or longitudinal. Mechanical Waves Mechanical waves are created by the vibration of objects. Mechanical waves can be either transverse or longitudinal. When an object vibrates, its vibrations form mechanical waves that