1. Compressional Waves
A Compressional waves – the vibration of the medium is parallel to the direction the wave travels.
Also known as longitudinal waves.
Examples: slinky, sound waves
                                   

2. The 2 main parts of a compressional wave are:. A
The 2 main parts of a compressional wave are: A. Compression- area of higher particle density within the wave
B. Rarefaction- area of lower particle density
within the wave

3. Sound Waves
Sound waves are a type of compressional wave which require a medium to travel.
Sound waves travel at about 750 mi/hr. This speed is effected slightly by the type of medium, temperature of medium, and elevation.

4. When an object such as a jet travels at a speed greater than 750 mi/hr it is said to be supersonic.
What happens when an object travels at supersonic speeds?

5. The ThrustSSC (supersonic car) broke the sound barrier on land, going 760 mi/hr on October 15, 1997.

6. The photo below shows the shock wave produced when the car broke the sound barrier.

7. Surface Waves
A wave that travels along a surface separating two media.
Example: Ocean waves

8. Underwater earthquakes can often produce tsunamis, giant ocean waves.

13. When Doug was driving from Kansas City to Denver, he crossed over from the central time zone to the mountain time zone. When he arrived he went to change the time on his cell phone, but found that it had already changed. How did that happen?