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Waves 7th grade science Introduction Audience: This lesson is for students in 7 th grade. Objective: Students will be able to identify a wave, understand.

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Presentation on theme: "Waves 7th grade science Introduction Audience: This lesson is for students in 7 th grade. Objective: Students will be able to identify a wave, understand."— Presentation transcript:

1

2 Waves 7th grade science

3 Introduction Audience: This lesson is for students in 7 th 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.

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

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

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

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

8 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? ?

9 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. Let’s Explore

10 Sound Waves Sound 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

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

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

13 Not quite right… Both the guitar and the speaker make sound waves by making vibrations in the air

14 Sound Waves You Can See Take a look at this video of a speaker creating sound waves in water. The water allows us to see the waves that are being created since we can’t see the air around us. (click on the link to play video) Look for the vibrations in the water when the speaker is on and watch them stop when the speaker stops playing h?v=_diS1twUbcU

15 Parts of a Wave Now 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.

16 Wavelength The 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 Crest Trough

17 Which letter represents the wavelength of this wave? C B A A – green line B – blue line C – red line

18 CORRECT! The wavelength is the distance between two crests or two troughs

19 Not quite, try again… C B A A – green line B – blue line C – red line Remember a wavelength is either from crest to crest or trough to trough

20 Frequency Frequency is the number of waves that travel past a point every second. Therefore shorter wavelengths means higher frequency and longer wavelengths means a lower frequency. Fewer waves means a lower frequency. (Click the speaker to listen) The more waves the higher the frequency. (Click the speaker to listen)

21 Which wave has a lower frequency? Red waveBlue wave

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

23 Not quite… Remember the frequency is the number of waves per second. The lower the frequency, the fewer waves per second. These waves will be more spaced out. Go back to review the information

24 Amplitude The third part of waves is called the Amplitude. The amplitude is how much energy a wave has. If it is a sound wave then a bigger amplitude will mean it’s a louder sound Low amplitude High amplitude

25 Which wave has a biggest amplitude? 1 2 3

26 Low amplitude High amplitude Not quite… Remember, 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 information

27 CORRECT! The taller the wave the bigger the amplitude. The bigger the amplitude the more energy a wave has. Low amplitude High amplitude

28 Different 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.

29 Waves have energy Waves 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 example /watch?v=6pVmAho2ew8 &feature=youtu.be

30 Waves Interacting with Matter When 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.

31 Examples tSec&feature=youtu.be Click the link below to see an example of how waves in earthquakes transfer energy

32 Quiz Time In 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 aren’t sure about any of those, go back to that section and review the material Proceed to the quiz Back to Back to Back to parts of waves Types of wavesHow waves are made Back to Interacting with matter

33 Sound moves through the air into our ears Sound particles enter our ears By loud noises By making vibrations in the air How does sound travel?

34 Try Again Beginning of quiz Click button to try again Back to studying

35 Next Question Back to studying Beginning of quiz

36 True False True or false: A speaker can create sound with out creating vibrations?

37 Try Again Beginning of quiz Click button to try again Back to studying

38 Next Question Back to studying Beginning of quiz

39 The wavelength The frequency The threshold The amplitude Which of these is not a part of a wave?

40 Try Again Beginning of quiz Click button to try again Back to studying

41 Next Question Back to studying Beginning of quiz

42 The size of the wavelength Number of waves per second The amount of energy a wave has None of the above Frequency is…

43 Try Again Beginning of quiz Click button to try again Back to studying Review what we learned earlier.

44 Next Question Back to studying Beginning of quiz

45 Water Information Energy Earthquakes Waves transfer ______ to matter it interacts with.

46 Try Again Beginning of quiz Click button to try again Back to studying

47 Next Question Back to studying Beginning of quiz

48 Water  Speaker Speaker  Water Ground  Water Seismic waves  Sound waves In this video, vibrations are being transferred from what to what? Click link to play video watch?v=_diS1twUbcU

49 Try Again Beginning of quiz Click button to try again Back to studying

50 Next Question Back to studying Beginning of quiz

51 Red Green Which wave has a larger amplitude, green or red?

52 Try Again Beginning of quiz Click button to try again Back to studying

53 Next Question Back to studying Beginning of quiz

54 The energy the wave is carrying is transferred The wave moves through the matter The wave stops moving The matter absorbs the waves energy When a wave interacts with matter, what happens?

55 Try Again Beginning of quiz Click button to try again Back to studying

56 Next Question Back to studying Beginning of quiz

57 True False True or false: This is an example of a wave.

58 Try Again Beginning of quiz Click button to try again Back to studying

59 Next Question Back to studying Beginning of quiz

60 You completed the quiz. Click below to go back to the beginning to review the material or to retake the quiz Beginning of quiz Beginning of material h?v=77slIdkkQWg Here’s a cool song about waves:


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