1. Mechanical Waves Chapter 17.1

2. What are Mechanical Waves? Mechanical wave = a disturbance in matter that carries energy from one place to another. The material through which a wave travels is called a medium. solids, liquids, and gases all act as mediums

3. A mechanical wave is created when a source of energy causes a vibration to travel through a medium. Source of Energy Vibration carries energy through rope Q. What is the medium? A. The rope

4. Types of Mechanical Waves Waves are classified by the way they move through a medium. Three main types: Transverse waves Longitudinal waves Surface waves

5. Transverse Wave Transverse wave = a wave that causes the medium to vibrate at right angles to the direction the wave travels http://cnx.org/content/m38806/1.2/?collection=col11305/latest transverse wave

6. Transverse Wave Crest = the highest point above rest position Trough = the lowest point below rest position Rest position CREST TROUGH

7. Longitudinal Waves Longitudinal wave = a wave in which the vibration of the medium is parallel to the direction the wave travels http://cnx.org/content/m38782/1.1/?collection=col11305/latest longitudinal wave

8. Longitudinal Waves Compression = an area in a medium where particles are spaced close together Rarefaction = an area in a medium where particles are spread out http://cnx.org/content/m38782/1.1/?collection=col11305/latest Compression Rarefaction

9. Surface Waves Surface wave = a wave that travels along a surface separating two media. Water Air In an ocean wave, what are the two media? ocean wave

10. Review 1.Which of the following is NOT true about mechanical waves? a)They carry energy b)They transfer matter c)They can be longitudinal d)They require a medium

11. Review 2.In which wave does the medium vibrate at right angles to the wave direction? a)Transverse b)Longitudinal c)Surface waves

12. Review 2.In which wave does the medium vibrate in the same direction as the wave direction? a)Transverse b)Longitudinal c)Surface waves