Mr. Blizzard, 8 th Grade Science Tanglewood Middle School.

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Presentation transcript:

Mr. Blizzard, 8 th Grade Science Tanglewood Middle School

Waves can be classified by WHAT they move through or by HOW energy moves through them. red words= vocabulary, blue words= connect words

There are two classifications for waves based on what they move through:  Mechanical Waves  Electromagnetic Waves red words= vocabulary, blue words= connect words

Mechanical waves are waves that can ONLY move through a medium (through matter). red words= vocabulary, blue words= connect words

Mechanical waves require the particles of the medium to vibrate in order for energy to be transferred. red words= vocabulary, blue words= connect words

 water waves  earthquake/seismic waves  sound waves  waves that travel down a rope or spring All of these examples CANNOT move through empty space.

Empty space is space in which NO MATTER is present. Another name for this is a vacuum. red words= vocabulary, blue words= connect words

Electromagnetic waves are waves that can travel through matter or empty space where matter is not present. red words= vocabulary, blue words= connect words

 radio waves  microwaves  infrared waves  visible light  ultraviolet rays  X-rays

There are two classifications for waves based on how energy moves through them:  Compressional/Longitudinal Waves  Transverse Waves red words= vocabulary, blue words= connect words

Mechanical waves in which the particles of matter in the medium vibrate by pushing together and moving apart parallel to the direction in which the wave travels are called compressional/longitudinal waves. red words= vocabulary, blue words= connect words

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The place on the wave that is pushed together is called the compression and the place that is moving apart is the rarefaction. red words= vocabulary, blue words= connect words

 sound waves  some waves in a spring  some seismic waves (earthquake waves- primary waves, to be exact)

Mechanical waves in which the particles of matter in the medium vibrate by moving back and forth and perpendicular (at right angles) to the direction the wave travels are called transverse waves. red words= vocabulary, blue words= connect words

science.hq.nasa.gov/kids/imagers/ems/waves3.html

The highest point of a transverse wave is the crest and the lowest point is called a trough. red words= vocabulary, blue words= connect words

 strings on a musical instrument  waves on a rope  some waves in a spring  some seismic waves (earthquake waves- secondary waves, to be exact)

Electromagnetic waves are transverse waves that can travel without a medium through empty space. red words= vocabulary, blue words= connect words

 Information from the South Carolina State Science Standards for 8 th Grade  Microsoft Clipart (the background picture)  _items/rarefaction_spring.html  science.hq.nasa.gov/kids/imagers/ems/waves 3.html