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Published byAbigail Arnold Modified over 9 years ago
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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.
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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:
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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.
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Solids, liquids, and gases all can act as mediums.
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A vibration is a repeating back-and-forth motion.
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The speed of a wave can change if it enters a new medium.
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What causes mechanical waves? A mechanical wave is created when a source of energy causes a vibration to travel through a medium.
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Three main types of mechanical waves: -- transverse waves -- longitudinal waves -- surface waves
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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
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E XAMPLE OF TRANSVERSE WAVES ! http://www.kettering.edu/~drussell/Demos/waves/wavemotion.html
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The wave carries energy from left to right, in a direction perpendicular to the up-and-down motion of the rope. Transverse Waves
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PARTS OF A WAVE The highest point of the wave is the crest. The lowest point of the wave is the trough.
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Amplitude The amplitude of a wave is the maximum displacement of the medium from its rest position.
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The more energy a wave has, the greater is its amplitude. Rest position High amplitude Low amplitude
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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
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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
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A N EXAMPLE OF A LONGITUDINAL WAVE IS A SLINKY
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P USH AT ONE END AND..
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SUMMARY
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A surface wave is a wave that travels along a surface separating two media. Example: Ocean waves
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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
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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
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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
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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
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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
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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
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S MALL GROUP : Discuss a sport where the athlete would need to understand the properties of waves.
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ONE EXAMPLE: A surfer needs to understand the properties of waves.
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