1. WAVES March 23 - Vocabulary Square

2. MECHANICAL WAVES March 24, 2011 – Vocabulary Square

3. AMPLITUDE March 28, 2011 – Vocabulary Square

4. March 31, 2011 Vocabulary Quiz: 1. A disturbance that transfers energy from place to place. 2. The material through which a wave travels. 3. Waves that require a medium through which to travel. 4. Mechanical waves that move across the direction of energy. 5. Mechanical waves that move parallel to the direction of energy.

5. Vocabulary quiz continued 6. The highest point on a transverse wave. 7. The lowest point on a transverse wave. 8. The part of a longitudinal wave where the coils are closest together. 9. The part of a longitudinal wave where the coils are spread out. 10. The maximum distance the medium travels from the rest position. 11. The distance between 2 corresponding parts of a wave. 12. The number of complete waves that pass a given point in a certain amount of time.

6. April 4, 2011 Create a vocabulary Square for the word –  Wave Speed Chapter 15, section 2

7. April 5, 2011 Create a Vocabulary Square for the word-  Reflection Chapter 15, section 3

8. April 6, 2011 Create a Vocabulary Square for the word-  Refraction Chapter 15, section 3

9. April 7, 2011 Create a Vocabulary Square for the word-  Interference Chapter 15, section 3

10. April 11, 2011 Create a Vocabulary Square for the word-  Standing Waves Chapter 15, section 3

11. April 13, 2011 Create a Vocabulary Square for the word-  Seismic Waves Chapter 15, section 3

12. Seismic Waves Seismic waves are waves that are produced by earthquakes. During an earthquake, the rock beneath the Earth’s surface moves. This movement occurs because of forces within the Earth creating pressure or stress on the rock. The pressure builds up and causes the rocks to break or change shape. The breaking or changing of shape releases energy in the form of waves. The waves move out in all directions from the point where the earthquake occurred, carrying energy through the Earth.

13. Types of Seismic Waves There are 3 types of seismic waves: P waves, S waves and Surface waves. P Waves 1. Longitudinal seismic waves are P waves. 2. They are also called primary waves. 3. They move faster than other seismic waves. 4. They arrive at distant points before other types of seismic waves because of their speed. 5. They are made of compressions and rarefactions and expand and compress the ground like a spring toy.

14. Types of Seismic Waves The second type of seismic waves is S Waves:  S waves are also known as secondary waves.  S waves are transverse waves.  They have crests and troughs.  They shake the ground up and down and side to side.  They cannot travel through liquid  Since the Earth’s core is liquid they do not travel through the Earth.  They cannot be detected on the side of the Earth opposite an earthquake.  Scientists on the opposite side of the Earth as the earthquake detect mainly P waves.

15. Types of Seismic Waves The 3 rd type of seismic waves is Surface Waves.  Surface waves consists of both longitudinal and transverse waves.  Surface waves travel along the surface of a medium.  They travel on the surface of the Earth during an earthquake.  They cause the most severe ground movements because they move both up-and-down and side-to-side.  They move more slowly than P waves and S waves.  Surface waves on the water produce tidal waves or Tsunamis.

16. Detecting Seismic Waves Scientists use instruments called Seismographs to detect and measure earthquakes. Seismographs record ground movements caused by seismic waves. On the same side of the earth as the earthquake seismographs will detect both P and S waves. On the side of the earth opposite the earthquake, seismographs only detect P waves. Comparing readouts from different seismographs from all over the world helps scientists pinpoint the starting point of the earthquake.

17. April 14, 2011 Come up with at least one question that you still have about mechanical waves.  You do not have to write it down. Take out a sheet of paper, fold it hotdog style and put your name, date, and period on the outside.