1. Homeroom Warm Up
Welcome back from Fall Break. Did you enjoy your fall break. Write about 3 things that you did over the break. Be prepared to share.

2. Science Warm Up

3. Homework Due Tuesday
Page 607 in textbook # 1-9

4. GLE’s GLE 0707.11.5 Compare and contrast the basic parts of a wave.
GLE Investigate the types and fundamental properties of waves.

5. What is a wave?
A wave is a moving vibration that transfers energy through matter or space.
2 types of Waves
Mechanical waves are transmitted through a medium, such as air or water. The energy of the wave causes the medium to vibrate. If there is no medium, as is the case in outer space, a mechanical wave will stop moving. Mechanical waves can be either transverse or longitudinal.
Electromagnetic waves can transfer energy through both a medium and empty space. Light is an electromagnetic wave. Only transverse

6. Transverse Vibrates perpendicular (at right angles) to the wave travel
Electromagnetic waves

7. Transverse Wave

8. Transverse Wave Vocabulary
Crest—a crest is the highest point of a transverse wave
Trough—a trough is the lowest point of a transverse wave
Wavelength—the distance between one wave crest and the next (or between one wave trough and the next).
Amplitude—the size of the displacement or change caused by the wave. The distance from the rest position to either the crest of trough of the wave.

9. Longitudinal
Vibrates parallel to (in the same direction of) wave travel
sound waves
the other end of the medium without the actual movement of matter

10. Longitudinal Wave

11. Longitudinal Use your Slinky to demonstrate a longitudinal wave:
Work with a partner
Stretch it out along the table
One of you grasp and draw several coils of a stretched Slinky toward yourself
Release the coils
The other student must hold his or her end of the Slinky still
A longitudinal wave pulse will be generated and travel down the length of the Slinky.

12. Longitudinal Waves Vocabulary
Compression—the area of a longitudinal wave in which the molecules are the most crowded together.
Rarefaction—the area of a longitudinal wave in which the molecules are the most spread apart
Wavelength—the distance from one point of compression to the next on a longitudinal wave

13. Other Vocabulary
Medium- a physical environment in which a wave travels through Wave Speed- how fast a wave is traveling Wave frequency-the number of wave crests that pass by a point each second; measured in hertz

14. Water Waves A combination of longitudinal & transverse
Animation courtesy of Dr. Dan Russell, Kettering University

15. Science Closure
A _______ is a repeating disturbance or vibration that transfers or moves energy from place to place without transporting mass. A. force B. vacuum C. wave D. medium

16. Academic Enrichment closure 9-17-2012