1. Waves Waves carry energy from one place to another

2. What is a wave? Wave- A wave is a disturbance that transfers energy from place to place without transporting any matter. Vibration- A repeated back-and-forth or up-and-down (or side-to-side) motion. A vibration is what causes a wave. Medium- The material a wave travels through. Gases, liquids, and solids act as mediums. Note taking example: Wave  transfers energy from place to place Vibration  repeated back-and-forth or up- and-down motion  causes a wave Medium  material wave travels through (gases, liquids, solids)

3. Types of Waves Transverse Waves Longitudinal Waves Surface (Combination) Waves **Note taking tip: list the three types of waves in your notes and leave space between each one** Note taking example: Types of waves Transverse (**leave space**) Longitudinal (**leave space**) Surface (Combination)

4. Transverse and Longitudinal Waves Transverse Waves- A wave that moves the medium up- and-down in a direction perpendicular to the direction the wave is traveling. Longitudinal Waves- A wave that moves the medium back-and-forth in a direction parallel to the direction the wave is traveling. Note taking: Types of waves: Transverse  moves medium up&down  movement perpendicular to direction wave travels (**leave space**) Longitudinal  moves medium back&forth  movement parallel to direction wave travels

5. Transverse Waves Crest- The highest point of a transverse wave. Trough- The lowest point of a transverse wave. Note taking: Types of waves: Transverse  moves medium up&down  movement perpendicular to direction wave travel  highest point called crest  lowest point called trough

6. Longitudinal Waves Compression- An increase in density and pressure in the medium. Rarefaction- A decrease in density and pressure in the medium. –In a spring or slinky, the parts where the coils are close together are compressions and the parts where the coils are spread out are rarefactions.

7. Surface Waves Surface (Combination) Waves- A wave that is a combination of both transverse and longitudinal waves. A surface wave occurs at the interface between two mediums, such as air and water or water of different densities. Longitudinal waves compress and expand like a slinky Transverse waves travel up and down like a rope + =Surface wave

8. Surface Waves Examples: –Water waves are a combination of both longitudinal and transverse motions. As a wave travels through the waver, the particles travel in clockwise circles. –Rayleigh surface waves are a combination of both longitudinal and transverse motions through solids. The particles in a solid, through which a Rayleigh surface wave travels, move in elliptical paths, with the major axis of the ellipse perpendicular to the surface of the solid.

9. Identify each type of wave.