Igniter 10/31:
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Igniter 10/31: Open textbook to page 454 and preview Chapter 14. Remember what to look for: PowerPoint PPT Presentation


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Igniter 10/31: Open textbook to page 454 and preview Chapter 14. Remember what to look for: Introduction Paragraph Read captions Look at Pictures Look at Diagrams Read Headings Read Sub-headings Scan Bold words Guide for reading Questions

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Igniter 10/31: Open textbook to page 454 and preview Chapter 14. Remember what to look for:

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  • Igniter 10/31:

  • Open textbook to page 454 and preview Chapter 14.

  • Remember what to look for:

    • Introduction Paragraph

    • Read captions

    • Look at Pictures

    • Look at Diagrams

    • Read Headings

    • Read Sub-headings

    • Scan Bold words

    • Guide for reading Questions

    • Checkpoint questions/End of Sect review questions


Bella the “Bunny”


Not that kind of wave!

Waves


What are waves?

  • A wave is a disturbance that transfers energy from place to place

  • What is the cause of waves?

    • When a source of energy causes a medium to vibrate

    • What is a medium?

      • Material through which a wave travels i.e. water

      • Can be solid, liquid or gas


Cause

  • When a source of energy causes a medium to vibrate.

    • Vibration is a back-and-forth or up-and-down motion

    • The motion is the source of the wave

  • Moving objects have energy  object can transfer energy to a medium creating a wave


What carries waves?

  • http://www.youtube.com/watch?v=7yPTa8qi5X8&feature=player_embedded

  • Most waves require something to travel through i.e. air or water

  • If waves require a medium to travel through they are called mechanical waves


Wave Types

  • Transverse Waves:

  • Move the medium at right angles in the direction in which the waves are travelling

  • Longitudinal Waves:

  • Moves particles of the medium parallel the direction that the waves are traveling

  • Combination of Waves:

  • Both transverse and longitudinal

    • Surface waves

http://www.kettering.edu/physics/drussell/Demos/waves/wavemotion.html


Transverse waves

  • Wave moves in one direction

  • Particles of the medium move across the direction of the wave

  • http://www.youtube.com/watch?v=UHcse1jJAto&feature=player_embedded


Transverse Waves Cont.

  • Parts of a wave:

Terms: crest, trough, wavelength, and amplitude

http://www.kirksville.k12.mo.us/khs/Teacher_Web/alternative/waves.html


Longitudinal Waves

  • Move the particles of a medium parallel to the direction the waves are travelling

  • Terms: Compression and rarefaction

http://www.kirksville.k12.mo.us/khs/Teacher_Web/alternative/waves.html


http://envirogeo.blogspot.com/2009/12/wednesday-122.html


Combination of Waves

  • Combination of transverse and longitudinal waves

  • Occur at the surface between two mediums example: water and air


Combination of Waves

  • Parts: crest and trough

http://adventure.howstuffworks.com/outdoor-activities/water-sports/surfing5.htm


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