physics of sound
Download
Skip this Video
Download Presentation
Physics of Sound

Loading in 2 Seconds...

play fullscreen
1 / 25

Physics of Sound - PowerPoint PPT Presentation


  • 143 Views
  • Uploaded on

Physics of Sound. Investigation 1: Dropping In Part 3 Sound and Vibrations. Objectives. I can identify a sound source . I can identify a sound receiver . I can describe , orally and in writing, what happens to vibrations when volume changes . Sound and Vibrations.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Physics of Sound' - evania


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
physics of sound
Physics of Sound

Investigation 1: Dropping In

Part 3

Sound and Vibrations

objectives
Objectives
  • I can identify a sound source.
  • I can identify a sound receiver.
  • I can describe, orally and in writing, what happens to vibrations when volume changes.
sound and vibrations
Sound and Vibrations
  • We will be exploring sounds made by two different objects. Watch how to use each object appropriately.
    • Long gong
    • Tuning fork
  • Treat the instruments with care.
  • If you hit them too hard, they may break.
tuning fork and long gong
Tuning Fork and Long Gong
  • You will get time to get to know the instruments, then you will use them for an investigation.
    • 5 minutes to explore
    • Repackage instrument
    • Switch with another group
  • GETTERs get materials.
  • STARTERs watch the clock and make sure everyone gets a turn.
share observations
Share Observations
  • Return all materials to the bags.
  • Think-Pair-Share
    • What did you hear?
    • What were the properties of the sounds you heard?
    • What did you see when the two instruments made sounds?
door fiddle
Door Fiddle
  • Guess what the teacher is making.
  • What do you see?
  • What do you hear?
  • How does the string feel when it is making its sound?
tone generator
Tone Generator
  • Watch the beans!
  • What do you see?
  • What do you hear?
  • How does the speaker feel when it is making its sound?
tone generator1
Tone Generator
  • The quick back-and-forth movement of the string and speaker cone that you observed is called a VIBRATION.
  • Sometimes vibrations are so fast that they are easier to feel than they are to see.
  • Some vibrations feel like a tickle or a buzz.
  • Where have you felt vibrations? What did you hear when you felt the vibration?
investigate
Investigate
  • We will use the long gongs and tuning forks to do detailed investigations.
  • This time you should look for vibrations when the turning fork and the long gong are making their sounds.
student sheets
Student Sheets
  • Open your yellow Physics of Sound packet to “The Tuning Fork” and “The Long Gong.”
  • Look at the headings. You will be expected to record information on these sheets while you investigate.
  • READ THE INSTRUCTIONS CAREFULLY.
    • Underline key words!
miniactivities
MiniActivities
  • STARTERs read the instructions aloud to the group.
  • After that, GETTERs get the materials.
  • When you are done with one activity, have a teacher check your sheet. They will let you know if you can move on to the next activity.
think about
Think About
  • What causes sound?
  • What is vibrating when you hear the sounds?
  • T-P-S
  • Return materials.
the source
The Source
  • Close your eyes. Be VERY quiet. Listen carefully to the sounds all around you for the next minute or so.
  • Raise your hand and identify a sound you heard.
  • Sound comes from a source. A sound source is where a vibration starts. Usually a sound source is a vibrating object, like a wire arch, a tuning fork, or a speaker cone.
the receiver
The Receiver
  • In order for a sound source to be heard, is must be detected (found) by a sound receiver. A sound receiver is something that responds to vibrations generated by a sound source.
  • Our ears are our sound receivers.
  • What other sound receivers can you think of?
volume
Volume
  • Demonstration: work with volume dial on tone generator, keeping the pitch the same.
    • What is the sound source?
    • What is the sound receiver?
    • How is the sound changing?
    • What happens to the vibrations when the sound is louder or softer?
volume1
Volume
  • Volume describes how loud a sound is.
  • STRONG vibrations make LOUD sounds.
  • Weak vibrations make soft sounds.
  • Volume is measured in decibels, named for Alexander Graham Bell, the inventor of the telephone.
volume2
Volume
  • Explore volume with the door fiddle, tone generator, tuning fork, and long gong.
  • Identify the sound sourcesand receivers.
  • How intense (strong or weak) is the vibration while the sound is being made?
objectives1
Objectives
  • I can identify a sound source.
  • I can identify a sound receiver.
  • I can describe, orally and in writing, what happens to vibrations when volume changes.
review reflect
Review/Reflect
  • What do vibrationshave to do with sound?
  • What are some examples of sound sources?
  • What are some examples of sound receivers?
  • What happens to the vibrations when the volume changes?
ad