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Rosal Lubana - U4L3: Waves Gizmo
History Revolutions
Secondary School
• 10High School - US
Comments
- Gracias por tener buen trabajo
- the only thing i didnt like was how this is highschool level so some of the questions i had to leave blank but other then that i love this
- the only thing i didnt like was how this is highschool level so some of the questions i had to leave blank but other then that i love this
- it helped me finish homework
- it helped me finish homework
- same bro this was worth 55 points and i didnt do it so i had to look it up
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U4L3 : Waves Gizmo
Link: Student Exploration: Waves
Directions: Follow the instructions to go through the simulation. Respond to the questions and prompts in the orange boxes.
Vocabulary: amplitude, compression, crest, frequency, linear mass density, longitudinal wave, medium, period, power, rarefaction, transverse wave, trough, wave, wavelength, wave speed
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
- A buoy is anchored to the ocean floor. A large wave approaches the buoy. How will the buoy move as the wave goes by?
The buoy will move up and down because the wave will push it.
- The two images show side views of ocean waves. How are the two sets of waves different?
The two images showing the two different sides of the ocean are different because the first image of the wave is higher than the second image of the ocean wave.
Gizmo Warm-up Ocean swells are an example of waves. In the Waves Gizmo, you will observe wave motion on a model of a spring. The hand can move the spring up and down or back and forth.
To begin, check that the Type of wave is Transverse , Amplitude is 20 cm, Frequency is 0 Hz, Tension is 3 N, and Density is 1 kg/m. (Note: In this Gizmo, “density” refers to the linear mass density , or mass per unit length. It is measured in units of kilograms per meter.)
- Click Play ( ). How would you describe the motion of a transverse wave? Click Pause ( ). Notice the crests (high points) and troughs (low points) of the wave.
A transverse wave moves from left to right, but the particles inside move up and down. The waves move left to right while the hand moves up and down.
- Click Reset ( ). Choose the Longitudinal wave and increase the Amplitude to 20 cm. Click Play. How would you describe the motion of a longitudinal wave? Click Pause. Notice the compressions in the wave where the coils of the spring model are close together and the rarefactions where the coils are spread apart.
In this wave, the hand is moving from the left to the right as well as the wave.
Have Mrs. Graham come check your work BEFORE you move on
Activity A:
Measuring waves
Get the Gizmo ready: ●Click Reset. Select Transverse waves. ●Set Amplitude to 20 cm, Frequency to 1 Hz, Tension to 2 N, and Density to 2 kg/m.
Question: How do we measure and describe waves?
- Observe : Click Play. Observe the motions of the hand and of the green dot in the middle.
A. What is the motion of the hand? Up and down
B. Turn off the Lights on the checkbox and observe the green dot. What is the motion of the green dot?
Up and down
C. Follow the motion of a single crest of the wave. How does the crest move?
Left to right
In a transverse wave , the motion of the medium (what the wave moves through—in this case, the spring) is perpendicular to the direction of the wave. So, each point of the spring moves up and down as the wave travels from left to right.
- Measure : With the lights on, click Pause. Turn on Show rulers.
A. Use the horizontal ruler to measure the horizontal distance between two crests. What is this distance?
100cm
This is the wavelength of the wave. B. What is the distance between the two troughs? 100cm
The wavelength can be found by measuring the distance between two successive crests, two successive troughs, or any two equivalent points on the wave.
C. Click Reset. Set the Density to 1 kg/m. Click Play , and then Pause. What is the wavelength of this wave?
140cm
- Measure : Click Reset. The amplitude of a transverse wave is the maximum distance a point on the wave is displaced, or moved, from its resting position. Turn off the lights. Click Play , and then click Pause. Use the vertical ruler to measure the height of the green trace, showing how far the green dot moved up and down. A. What is the height of the green trace? 40cm
B. The wave’s amplitude is equal to half of this height. What is the amplitude?
20cm
- Observe : Click Reset. Select Lights on and turn off Show rulers. Select Longitudinal waves. Check that the Amplitude is 10 cm, the Frequency is 1 Hz, and the Tension is 2 N. Set the Density to 1.
Activity B:
Wave dynamics
Get the Gizmo ready: ●Click Reset. Check that Transverse is selected. ●Set Amplitude to 20 cm, Frequency to 0 Hz, Tension to 3 N, and Density to 1 kg/m.
Question: What factors affect the wavelength, speed, and power of waves?
- Record : The speed of a wave is the distance a wave pulse travels per second. The wave speed is displayed below the spring. Click Play. What is the wave speed?
173 cm/s
- Experiment : The wavelength and speed of a wave can be influenced b y many factors. Adjust the amplitude, frequency, tension, and density as described in the table below. Then report whether this causes the wavelength and wave speed to increase or decrease. Return each variable to its original value after each experiment.
Adjustment Effect on wavelength Effect on wave speed Increase amplitude stays the same stays the same Increase frequency decreases stays the same Increase tension increases increases Increase density increases decreases
- Analyze : Click Reset. Set the Frequency to 0 Hz, Tension to 2 N, and Density to 2 kg/m. Click Play , and then click Pause. Turn on Show rulers.
A. What is the wavelength? 125 cm
B. What is the wave speed? 100 cm/s
C. How are the wavelength, frequency, and wave speed related? In general, the wave speed ( v ) can be calculated from the frequency ( f ) and wavelength ( λ ) using the formula v = f • λ.
v=fλ
D. What is the wavelength of a wave with f = 0 Hz and v = 154 cm/s? To check, set Frequency to 0 Hz, Tension to 2 N, and Density to 1 kg/m.
172 cm
E. Change the Density to 1 kg/m, and click Play. Based on the wave speed, what do you expect the wavelength to be? Measure the wavelength to check.
It will decrease.
- Gather data : Click Reset , and turn off Show rulers. The power of a wave is the amount of energy it transmits each second. The power of the wave is displayed below the spring when Play is pressed. Record
the wave power for each of the settings below.
Amplitude Frequency Tension Density Power 20 cm 0 Hz 2 N 1 kg/m 0 W 40 cm 0 Hz 2 N 1 kg/m 1 W
20 cm 0 Hz 2 N 1 kg/m 0 W 20 cm 1 Hz 2 N 1 kg/m 1 W
20 cm 0 Hz 2 N 1 kg/m 0 W 20 cm 0 Hz 4 N 1 kg/m 0 W
20 cm 0 Hz 2 N 0 kg/m 0 W
20 cm 0 Hz 2 N 1 kg/m 0 W
Which factors increased the power of the wave? Amplitude, frequency, tension, and density
- Compare : Click Reset. Select Longitudinal waves. Set Amplitude to 20 cm, Frequency to 0 Hz, Tension to 2 N, and Density to 1 kg/m. Click Play.
A. What is the power of this longitudinal wave? .402 W
B. Compare this power to the power of a transverse wave with the same settings. Does changing the type of wave affect its power? The power of the wave stayed the same
- Apply : Sound waves are longitudinal waves that can travel through air. Would you expect sound waves to travel faster through a low-density gas (such as helium) or a higher-density gas such as carbon dioxide? Justify your answer based on what you have learned.
Travel faster in low density gas. The lower the density the faster they travel.
- Apply : As ocean waves approach the shore, friction with the ocean bottom causes them to slow down. If the frequency is the same, how will this affect the wavelength of the waves?
The wavelength of the waves would shrink if the frequency remained constant. The frequency and wavelength of a wave determine its velocity. If the velocity falls to the same level as the frequency, the wavelength must fall as well.
Have Mrs. Graham come check your work BEFORE you move on
Rosal Lubana - U4L3: Waves Gizmo
Subject: History Revolutions
Secondary School
• 10
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