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

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

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

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#### Presentation Transcript

• Igniter 10/31:

• Open textbook to page 454 and preview Chapter 14.

• Remember what to look for:

• Introduction Paragraph

• Look at Pictures

• Look at Diagrams

• Scan Bold words

• 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?

• 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

### 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