Waves Comprehension Check 1. Name of Wave 8. Definition of Wave (medium compared to energy transfer) 9. Name of Wave 13. Another Name for the Wave 14. Definition of Wave (medium compared to energy transfer) # 4 is a BONUS

Warm-UP Exercise 3/15/12 B D A C Draw the wave &Identify the parts labeled A – D below B D A C

Springy Waves Lab- INB pg. 24 Your table will be given coiled springs. At separate times, hold the coiled spring on the floor or on a cleaned table between you a classmate so that the spring is straight. This is the rest position. Move one end of the spring back and forth at a constant rate. Note the wavelength of the wave you create. Copy and answer the following questions in your science journal. A. Increase the amplitude of the waves. What did you have to do? How did the change in amplitude affect the wavelength? Model this for both transverse and longitudinal waves. B. Now shake the springs back and forth about twice as fast as you did before. What happens to the wavelength? Record your observations.

Review: Mechanical Waves Cause rhythmic disturbances in a medium Travel through a medium Transmit energy

Compare Transverse and Compressional Waves Copy & complete Characteristic Transverse Wave Compressional Wave Wave Shape Wave Cycle Medium travel compared to energy transfer Wavelength Amplitude Frequency

Characteristics of a Compressional or Longitudinal Wave Compression – crowded or dense area Rarefaction – less dense or spread out area

Characteristics of a Compressional or Longitudinal Wave Wave Cycle – one compression and one rarefaction

Characteristics of a Compressional or Longitudinal Wave Wavelength – distance between two compressions

Characteristics of a Compressional or Longitudinal Wave Amplitude – measure of the amount of compression; depends on the amount of energy being transferred

Characteristics of a Compressional or Longitudinal Wave Frequency – number of compressions that pass a stationary point in one second

Compare Transverse and Compressional Waves Copy & complete with your partner Characteristic Transverse Wave Compressional Wave Wave Shape Wave Cycle Medium travel compared to energy transfer Wavelength Amplitude Frequency

Transverse and Compressional Waves Characteristic Transverse Wave Compressional Wave Wave Shape Wave Cycle Same as frequency 1 Rarefaction/1 Compression Medium travel compared to energy transfer Perpendicular (right angles) Same Direction Wavelength Distance from one point on wave to same point on next wave (crest to crest) Distance between compressions Amplitude Distance from crest/trough to rest position Amount (thickness) of compression Frequency # of crests that pass per second # of compressions that pass per second

Complete the Mechanical Wave Graphic Organizer

"Just Checking In" Review Working with your seat partner on one sheet of paper answer the following questions for bonus points………..

"Just Checking In" Review What do waves transfer?

"Just Checking In" Review Name two mechanical waves.

"Just Checking In" Review Waves that do require a medium are called _____

Warm-up Activity 2/19/09 Draw a Venn Diagram to compare and contrast transverse waves and compressional (or longitudinal) waves?

"Just Checking In" Review The crest and trough of a transverse wave to compare to which two features of a compressional wave?

"Just Checking In" Review What symbols are used represent wavelength and frequency?

"Just Checking In" Review What are the units used to measure frequency and the speed of a wave?