Transverse and Transverse and Compressional WavesCompressional Waves

CurriculumCurriculum• Big Idea: Big Idea: Waves carry energy from one Waves carry energy from one

location to another without the transfer location to another without the transfer of matter.of matter.

• Concept: Mechanical waves can be classified Concept: Mechanical waves can be classified according to their movement, standing or according to their movement, standing or compression, and according to their direction compression, and according to their direction of oscillation, which can be transverse or of oscillation, which can be transverse or longitudinal.longitudinal.

PA Standard: PA Standard: 3.2.10.B5:3.2.10.B5: Understand that waves Understand that waves transfer energy without transferring matter.transfer energy without transferring matter.

Today’s AgendaToday’s Agenda• OpenerOpener: Watch the Galloping Gertie : Watch the Galloping Gertie videovideo, and answer the , and answer the “What “What

Do You Think?”Do You Think?” Questions in the 5.1: Waves and Energy packet Questions in the 5.1: Waves and Energy packet• DefineDefine the following Physics Words in your packet: wave, the following Physics Words in your packet: wave,

transverse wave, compressional (longitudinal) wavetransverse wave, compressional (longitudinal) wave• For You To Do Part IFor You To Do Part I: Transverse vs. Longitudinal: Transverse vs. Longitudinal

1. 1. Make a “people wave,”Make a “people wave,” like at a Phillies game, and answer #1 like at a Phillies game, and answer #1 a-e in the packet. a-e in the packet. DiscussDiscuss your answers in small groups and as a your answers in small groups and as a class.class.2. 2. Make a different people waveMake a different people wave by following the instructions from by following the instructions from the teacher. Answer #2 a-d in the packet. the teacher. Answer #2 a-d in the packet. DiscussDiscuss your answers in your answers in small groups and as a class.small groups and as a class.

• Electricity ReviewElectricity Review• ClosureClosure: What is the difference between a transverse wave and a : What is the difference between a transverse wave and a

compressional (longitudinal) wave?compressional (longitudinal) wave?Take Home AssignmentTake Home Assignment: Answer the Physics To Go questions #1-2 in : Answer the Physics To Go questions #1-2 in

the the Unit 5.1 packet.Unit 5.1 packet.

Galloping Gertie VideoGalloping Gertie Videohttp://videos.howstuffworks.com/tlc/29http://videos.howstuffworks.com/tlc/29833-understanding-tacoma-narrows-bri833-understanding-tacoma-narrows-bridge-video.htmdge-video.htm

Today’s Physics VocabularyToday’s Physics Vocabulary• WaveWave – a wiggle in space and time. Transfers – a wiggle in space and time. Transfers

energy without transferring matter.energy without transferring matter.• Transverse waveTransverse wave – a wave in which the – a wave in which the

vibrations are at right angles to the direction vibrations are at right angles to the direction the wave (pulse) travels.the wave (pulse) travels.

• Compressional (longitudinal) waveCompressional (longitudinal) wave – a wave – a wave in which the vibrations travel in the same in which the vibrations travel in the same direction that the wave (pulse) travels.direction that the wave (pulse) travels.