What causes the different seasons?

Waves7th grade science

IntroductionAudience: This lesson is for students in 7th grade.Objective: Students will be able to identify a wave, understand that a wave is produced by vibrations in matter and demonstrate how waves transfer energy when they interact with matter.SoundWhere does sound come from? Where do you hear sound in the world around you?Click the ?SoundWhere does sound come from? Where do you hear sound in the world around you?Click the ?

SoundWhere does sound come from? Where do you hear sound in the world around you?Click the ?

SoundWhere does sound come from? Where do you hear sound in the world around you?

How does sound travel?We have an idea of where sound comes from, but how does it get from where it is to us so we can here it? How does sound travel?

?Waves!Sound travels in waves. But what is a wave?A wave is caused when vibrations, or movement, is caused in matter, or the stuff around us. For example, the speakers on a radio use energy to vibrate the air around it. These vibrations travel through the air in a wave and eventually reach your ear which is what allows you to hear. Lets Explore

Sound WavesSound waves are caused when objects create vibrations. This energy vibrates the air around it creating a wave. When you pluck a guitar string, the string vibrates and produces a wave.If you look at a speaker when it is playing you will see it vibrate. This produces a sound wave the same way the guitar does

True or False, a guitar string and a speaker make a sound wave the same way?True

FalseCORRECT!Both the guitar and speaker create sound waves by making vibrations in the air

Parts of a WaveNow that we know that sound travels in waves there must be different parts of a wave because we hear different sounds.There are 3 things that make up a wave. They are wavelength, frequency and amplitude.WavelengthThe wavelength is how far apart the waves are. This can be measure from either crest to crest or trough to trough. This is equal to one wave length.Crest top of the wave Trough bottom of the wave

CrestCrestTroughTroughWhich letter represents the wavelength of this wave?

CBAA green line B blue line C red lineWhich wave has a lower frequency?

Red waveBlue waveCORRECT!The red line is a lower frequency because it has larger wavelengths and therefore less waves per second.

Which wave has a biggest amplitude?

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Low amplitudeHigh amplitudeNot quiteRemember, amplitude is based on how tall the waves are. The taller the waves the bigger the amplitude and more energy the wave has Go back to review the informationDifferent types of waves-There are other waves besides sound waves. Waves also move through the water and waves known as seismic waves cause the Earth to shake during and earthquake.

Waves have energyWaves move through matter, they do not push matter along. For example, waves in the ocean are not carrying a lot of water with them but are simply moving through the water. Watch this video to learn more about waves in the ocean and see an examplehttp://www.youtube.com/watch?v=6pVmAho2ew8&feature=youtu.beWaves Interacting with MatterWhen waves interact with matter, the energy they are carrying is transferred to that object causing it to vibrate. With sound waves that allows us to hear and with seismic waves during earthquakes, that can make buildings fall down. Click to the next slide to see an example of how waves interact with buildings and can knock them down.Exampleshttp://www.youtube.com/watch?v=MRNxhIatSec&feature=youtu.beClick the link below to see an example of how waves in earthquakes transfer energyQuiz TimeIn the upcoming quiz you will be answer questions about the different parts of waves, different types of waves, how waves are made and how they interact with matter. If you arent sure about any of those, go back to that section and review the materialProceed to the quizBack to Back to Back toparts of waves Types of wavesHow waves are madeBack toInteracting with matterSound moves through the air into our earsSound particles enter our earsBy loud noisesBy making vibrations in the airHow does sound travel?

TryAgainBeginning of quizClick button to try againBack to studyingTrueFalseTrue or false: A speaker can create sound with out creating vibrations?

TryAgainBeginning of quizClick button to try againBack to studyingThe wavelengthThe frequencyThe thresholdThe amplitudeWhich of these is not a part of a wave?

TryAgainBeginning of quizClick button to try againBack to studyingThe size of the wavelengthNumber of waves per secondThe amount of energy a wave hasNone of the aboveFrequency is

TryAgainBeginning of quizClick button to try againBack to studyingReview what we learned earlier.WaterInformationEnergyEarthquakesWaves transfer ______ to matter it interacts with.

TryAgainBeginning of quizClick button to try againBack to studyingWater SpeakerSpeaker WaterGround WaterSeismic waves Sound wavesIn this video, vibrations are being transferred from what to what?Click link to play videohttp://www.youtube.com/watch?v=_diS1twUbcU

TryAgainBeginning of quizClick button to try againBack to studyingRedGreenWhich wave has a larger amplitude, green or red?

TryAgainBeginning of quizClick button to try againBack to studyingThe energy the wave is carrying is transferredThe wave moves through the matterThe wave stops movingThe matter absorbs the waves energyWhen a wave interacts with matter, what happens?

TryAgainBeginning of quizClick button to try againBack to studying

TrueFalseTrue or false: This is an example of a wave.

TryAgainBeginning of quizClick button to try againBack to studyingYou completed the quiz. Click below to go back to the beginning to review the material or to retake the quizBeginning of quizBeginning of materialCONGRATULATIONShttp://www.youtube.com/watch?v=77slIdkkQWgHeres a cool song about waves: