# I will know the three different types of mechanical waves. I will know the relationships among speed, wavelength, and frequency. I will be able to identify.

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I will know the three different types of mechanical waves. I will know the relationships among speed, wavelength, and frequency. I will be able to identify and name the different parts of a wave structure. I will be able to solve story problems for the wave equation.

In a wave pool, the waves carry energy across the pool. You can see the effects of a wave's energy when the wave lifts people in the water. Fun Fact:

A mechanical wave is a disturbance in matter that carries energy from one place to another. The material through which a wave travels is called a medium.

Solids, liquids, and gases all can act as mediums.

A vibration is a repeating back-and-forth motion.

The speed of a wave can change if it enters a new medium.

What causes mechanical waves? A mechanical wave is created when a source of energy causes a vibration to travel through a medium.

Three main types of mechanical waves: -- transverse waves -- longitudinal waves -- surface waves

1. A transverse wave causes the medium to vibrate in a direction perpendicular to the direction in which the wave travels. Crest Direction of wave Trough Direction of vibration

E XAMPLE OF TRANSVERSE WAVES ! http://www.kettering.edu/~drussell/Demos/waves/wavemotion.html

The wave carries energy from left to right, in a direction perpendicular to the up-and-down motion of the rope. Transverse Waves

PARTS OF A WAVE The highest point of the wave is the crest. The lowest point of the wave is the trough.

Amplitude The amplitude of a wave is the maximum displacement of the medium from its rest position.

The more energy a wave has, the greater is its amplitude. Rest position High amplitude Low amplitude

Wavelength can be measured from any point on a wave to the same point on the next cycle of the wave. Long wavelengthShort wavelength Rest position

2. A longitudinal wave is a wave in which the vibration of the medium is parallel to the direction the wave travels. Direction of wave Direction of vibration

A N EXAMPLE OF A LONGITUDINAL WAVE IS A SLINKY

P USH AT ONE END AND..

SUMMARY

A surface wave is a wave that travels along a surface separating two media. Example: Ocean waves

Turn to a partner #1 1. How does a mechanical wave carry energy from one place to another? A. vibration of a medium B. physical transfer of matter C. phase changes of a medium D. interaction of electromagnetic fields

Turn to a partner #1 -- answer 1. How does a mechanical wave carry energy from one place to another? A. vibration of a medium B. physical transfer of matter C. phase changes of a medium D. interaction of electromagnetic fields

Turn to a different partner #2 2. Name the wave in which the vibration of the medium is parallel to the direction the wave travels. A. longitudinal wave B. sound wave C. surface wave D. transverse wave

Turn to a different partner #2 2. Name the wave in which the vibration of the medium is parallel to the direction the wave travels. A. longitudinal wave B. sound wave C. surface wave D. transverse wave

Turn to a partner #3 3. Which example describes a transverse wave? A. sound wave traveling through air B. ocean wave far from the shore C. ocean wave as it approaches the shore D. light wave traveling through space

Turn to a partner #3 3. Which example describes a transverse wave? A. sound wave traveling through air B. ocean wave far from the shore C. ocean wave as it approaches the shore D. light wave traveling through space

S MALL GROUP : Discuss a sport where the athlete would need to understand the properties of waves.

ONE EXAMPLE: A surfer needs to understand the properties of waves.

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