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Focus : Waves Objective: Explain what transverse and longitudinal waves are, how they are alike and how they are different. We will b e able to say how they occur in earthquakes. Vocabulary to Know. Examples: In the OceanIn the Clouds Earthquake. Sound waves are longitudinal.

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Focus : Waves

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Focus waves

Focus: Waves

Objective: Explain what transverse and longitudinal waves are, how they are alike and how they are different. We will be able to say how they occur in earthquakes.


Vocabulary to know

Vocabulary to Know

Examples:

In the OceanIn the Clouds Earthquake


Sound waves are longitudinal

Sound waves are longitudinal.

Longitudinal waves

Transverse waves


Seismic waves are what we call the waves that happen during an earthquake

Seismic waves are what we call the waves that happen during an earthquake.

  • When an earthquake happens, energy waves vibrates through the earth’s crust as the crust bends or breaks.


During an earthquake there are both

During an earthquake, there are both:

  • Transverse waves

  • Longitudinal waves


Which wave travels faster

Which wave travels faster?

Think-Pair-Share:

  • Think about the slinky

  • Let’s find out!

    • Human wave activity

Since the energy is traveling the fastest way it can (in a straight line), the longitudinal wave is faster than the transverse wave. It gets from the force to the stopping point first. It is the first wave you feel in an earthquake.

The transverse wave takes more time and energy to go perpendicular to the direction of the wave. You feel this wave second in an earthquake. It is sometimes called the “aftershock”.


Which wave does more damage

Which wave does more damage?

Think-Pair-Share:

Write the questions and answer them in your interactive notebook.

  • Which wave do you think would do more damage to a city? Write this as a hypothesis. (“I think…because…”

  • Why do you think so?

  • Let’s find out!

    • Human wave activity with buildings


Focus waves

What are the parts of a wave?

Transverse wave

**WRITE THIS DOWN**

The crest is the highest point on a transverse wave. The trough is the lowest point on a transverse wave.

The rest position of the wave is called the node or nodal line.


Write this down

**WRITE THIS DOWN**

CREST

TROUGH


Focus waves

What are the parts of a wave?

Transverse wave

**WRITE THIS DOWN**

The wavelength is the distance from one point on the wave to the same point on the next wave.


Focus waves

SLINKY LAB


Focus waves

On a compressional wave the (**WRITE THIS DOWN**) area squeezed together is called the compression. The areas spread out are called the rarefaction.

(**WRITE THIS DOWN**)The wavelength is the distance from the center of one compression to the center of the next compression.

Compressional

Longitudinal wave


Focus waves

SLINKY LAB


Focus waves

**WRITE THIS DOWN**

The amplitude of a transverse wave is determined by the height of the crest or depth of the trough


Write this down1

**WRITE THIS DOWN**

How high does it go?

How low does it go?


Focus waves

What is wavelength? (**WRITE IT DOWN**)

Wavelength is a measure of distance, so the units for wavelength are always distance units, such as meter, centimeters, millimeters, etc.


Focus waves

What is wave frequency?

Frequency is the number of waves that pass through a point in one second. The unit for frequency is waves per second or Hertz (Hz). One Hz = One wave per second. (**WRITE THAT DOWN**)

The smaller the wavelength, the more times it will pass through a point in one second. The larger the wavelength, the fewer times it will pass through a point in one second.


Focus waves

Focus: Waves

Objective: Compare the properties of waves to the wavelike property of energy in earthquakes, light and sound.

EQ:What are the 2 kinds of mechanical waves? How are they similar? How are they different?


Waves

WAVES


Vocabulary to know1

Vocabulary to Know

Examples:

In the OceanIn the Clouds Earthquake


Sound waves are longitudinal1

Sound waves are longitudinal.

Longitudinal waves

Transverse waves


Seismic waves are what we call the waves that happen during an earthquake1

Seismic waves are what we call the waves that happen during an earthquake.

  • When an earthquake happens, energy waves vibrates through the earth’s crust as the crust bends or breaks.


During an earthquake there are both1

During an earthquake, there are both:

  • Transverse waves

  • Longitudinal waves


Which wave travels faster1

Which wave travels faster?

Think-Pair-Share:

  • Think about the slinky

  • Let’s find out!

    • Human wave activity

Since the energy is traveling the fastest way it can (in a straight line), the longitudinal wave is faster than the transverse wave. It gets from the force to the stopping point first. It is the first wave you feel in an earthquake.

The transverse wave takes more time and energy to go perpendicular to the direction of the wave. You feel this wave second in an earthquake. It is sometimes called the “aftershock”.


Which wave does more damage1

Which wave does more damage?

Think-Pair-Share:

Write the questions and answer them in your interactive notebook.

  • Which wave do you think would do more damage to a city?

  • Why do you think so?

  • Let’s find out!

    • Human wave activity with buildings


Focus waves

What are the parts of a wave?

Transverse wave

The crest is the highest point on a transverse wave. The trough is the lowest point on a transverse wave.

The rest position of the wave is called the node or nodal line.


Vocabulary to know2

Vocabulary to Know

CREST

TROUGH


Focus waves

What are the parts of a wave?

Transverse wave

The wavelength is the distance from one point on the wave to the same point on the next wave.


Focus waves

Compressional

Longitudinal wave

On a compressional wave the area squeezed together is called the compression. The areas spread out are called the rarefaction.

The wavelength is the distance from the center of one compression to the center of the next compression.


Focus waves

The amplitude of a transverse wave is determined by the height of the crest or depth of the trough


Vocabulary to know3

Vocabulary to Know

How high does it go?

How low does it go?


Focus waves

What is wavelength?

Wavelength is a measure of distance, so the units for wavelength are always distance units, such as meter, centimeters, millimeters, etc.


Focus waves

What is wave frequency?

Frequency is the number of waves that pass through a point in one second. The unit for frequency is waves per second or Hertz (Hz). One Hz = One wave per second.

Wavelength and frequency are inversely related.

The smaller the wavelength, the more times it will pass through a point in one second. The larger the wavelength, the fewer times it will pass through a point in one second.


Vocabulary to know4

Vocabulary to Know

3

3

How many crests?

How many troughs?

http://id.mind.net/~zona/mstm/physics/waves/introduction/introductionWaves.html


Waves have measurable properties

Waves have measurable properties


Focus waves

Frequency is the number of waves (vibrations) that pass through a point in one second.

Period is the time it takes for one full wavelength to pass a certain point.

Frequency is waves per second.

Period is seconds per wave.


Focus waves

A wave moving through a medium travels at a certain speed. This is Wave Speed.

Wave speed is usually measured in meters/second, but may be measured using other distance units (such as centimeters per second).

How is Wave Speed calculated?

Wave speed is calculated as the product of a waves frequency and wavelength.

Wavelength is represented by the Greek letter lambda (λ) and frequency is represented by (f)


Vocabulary to know5

Vocabulary to Know

3

3

How many crests?

How many troughs?

http://id.mind.net/~zona/mstm/physics/waves/introduction/introductionWaves.html


Waves have measurable properties1

Waves have measurable properties


Focus waves

Frequency is the number of waves (vibrations) that pass through a point in one second.

Period is the time it takes for one full wavelength to pass a certain point.

Frequency is waves per second.

Period is seconds per wave.


Focus waves

A wave moving through a medium travels at a certain speed. This is Wave Speed.

Wave speed is usually measured in meters/second, but may be measured using other distance units (such as centimeters per second).

How is Wave Speed calculated?

Wave speed is calculated as the product of a waves frequency and wavelength.

Wavelength is represented by the Greek letter lambda (λ) and frequency is represented by (f)


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