Monday, January 27, 2014

By the end of the day today, IWBAT…• Analyze characteristics of waves (velocity, frequency, amplitude, wavelength) and calculate using the relationship between wavespeed, frequency, and wavelength.

Do Now: Calculate the speed of a periodic wavethat has a wavelength of 3.0 m and afrequency of 4.0 Hz.

Monday, January 27, 2014

Do Now: Calculate the speed of a periodic wavethat has a wavelength of 3.0 m and afrequency of 4.0 Hz.Calculate the speed of a periodic waveλ = 2.0 m and f = 3.0 Hz.λ x f = 3.0 m x 4.0 Hz = 12.0 m/s

SIM Q.

Why it matters in THIS CLASS: Unit #9 Exam this Friday, January 31, 2014.

BE PREPARED!

Why it matters in LIFE:We interact with WAVES every day: your music is delivered to your ears via sound waves. Waves even quake the earth beneath our feet.

By the end of the day today, IWBAT…• Analyze characteristics of waves (velocity, frequency, amplitude, wavelength) and calculate using the relationship between wavespeed, frequency, and wavelength.

Another Magic Triangle…

Monday, January 27, 2014

Do Now #2: Calculate the wavelength of a water wave with a speed of 3.0 m/s and frequency of4.0 Hz. (Answer in meters to the hundredths.)

Calculate the wavelength λ x f = v  → v f = λ

T.Q.

Monday, January 27, 2014

Do Now #2: Calculate the wavelength of a water wave with a speed of 3.0 m/s and frequency of4.0 Hz. (Answer in meters to the hundredths.)

Calculate the wavelength λ x f = v  → v f = λ3.0 m/s 4.0 Hz = λ = 0.75 m

T.Q.

Transverse

Longitudinal

• The Unit 9 Cover Sheet goes into your journals to keep track of

your completed daily work prior to the exam. Record all

assignments and keep it together.

Unit 9: Mechanical Waves

Monday, 01/27/14

TEKS: P.7B Investigate and

analyze characteristics of waves, including velocity, frequency, amplitude, and

wavelength…

By the end of today,

IWBAT…calculate using the relationship

between wavespeed,

frequency, and wavelength.

Essential Question:How do we calculate

wavespeed, frequency and wavelength?

Topic:Mechanical

Wave Equations

C-Notes & Equation Practice!

Mechanical Waves Equations Use your Mini-Books for reference Create a sample wave on your C-Notes

and label all components. Identify each component of the

waveform Solve the sample questions using wave

equations.

Y-axis = displacement, the distance of a particle from its equilibrium position

X-axis can represent either time or distance from a specified point within the medium. A displacement-time graph shows the displacement of one particle of the medium as time goes by. A displacement-distance graph shows the displacement of all particles of the medium at one instant in time.

A = amplitude, the maximum displacement from equilibrium of any particle

Crest and trough are the points of maximum displacement from equilibrium above and below equilibrium position respectively.

λ = wavelength, the distance between two consecutive identical points on the wave eg between two crests or two troughs.

Frequency = equals the number of waves that passes a given point per second.

v = velocity, the speed with which the energy is being transferred in the direction of motion.

What is the amplitude of the pendulum swing based on the graph?

At what time will the pendulum be at a crest?

T.Q.

What is the amplitude of the pendulum swing based on the graph? 2.5 m

At what time will the pendulum be at a crest? 0.5 s

T.Q. A

What is the wavelength of the wave?

If the spring oscillates at a rate fo 4 times per second, what is the velocity of the wave?

T.Q.

What is the wavelength of the wave? 1.0 m

If the spring oscillates at a rate of 4 times per second, what is the velocity of the wave? λ x f = (1.0m) x (4/1) = 4.0 m/s

T.Q.

λ