1. 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

2. Bella the “Bunny”

3. Waves Not that kind of wave!

4. 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

5. 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

6. What carries waves? http://www.youtube.com/watch?v=7y PTa8qi5X8&feature=player_embedde d http://www.youtube.com/watch?v=7y PTa8qi5X8&feature=player_embedde d 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

7. 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/Demo s/waves/wavemotion.html

8. Transverse waves Wave moves in one direction Particles of the medium move across the direction of the wave http://www.youtube.com/watch?v=U Hcse1jJAto&feature=player_embedd ed http://www.youtube.com/watch?v=U Hcse1jJAto&feature=player_embedd ed

9. 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

10. 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

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

12. Combination of Waves Combination of transverse and longitudinal waves Occur at the surface between two mediums example: water and air

13. Combination of Waves Parts: crest and trough http://adventure.howstuffworks.com/outdoor-activities/water-sports/surfing5.htm