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The Motion Harbor Wave Model

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The Motion Harbor Wave Model

Use wave models and test results to judge a museum exhibit design.

Read the wave test

Read the museum team's notes. Use the models and test results to answer the questions.

The Motion Harbor Exhibit

The Children's Museum planned a Motion Harbor exhibit. Visitors would move one end of an elastic cord to send repeating waves toward a light ring resting on the cord. The team measured wave height from the resting level up to a crest. They measured crest spacing from one crest to the next crest along the cord. A model showed the cord's pattern, but it did not show the ring's motion unless the team added that information.

The team made three wave models. In Model A, the resting level was 5 units. Crests reached 8 units, troughs reached 2 units, and neighboring crests were 8 centimeters apart. In Model B, the resting level was 5 units. Crests reached 9 units, troughs reached 1 unit, and neighboring crests were 8 centimeters apart. In Model C, the resting level was 5 units. Crests reached 8 units, troughs reached 2 units, and neighboring crests were 4 centimeters apart.

The team then tested the cord and ring. Test P used the pattern of Model A. The ring moved up and down 6 centimeters and moved 1 centimeter sideways. Test Q used the pattern of Model B. The ring moved up and down 8 centimeters and moved 1 centimeter sideways. Test R used the pattern of Model C. The ring moved up and down 6 centimeters and moved 1 centimeter sideways. In Test S, the cord was held still instead of sending waves. The ring moved 0 centimeters up and down and 0 centimeters sideways.

The team kept the same cord and ring for the tests. They measured the ring from its lowest position to its highest position for the up-and-down distance. They wanted a model that showed both the repeating wave pattern and the way the ring moved as waves passed.

1.
How does Model B compare with Model A?
Question 1 options
2.

In Model A, how many units above the resting level is each crest? units

3.

In Model C, how many centimeters apart are neighboring crests? centimeters

4.
Which pair of tests best compares the effect of changing wave height while keeping crest spacing the same?
Question 4 options
5.
Select the TWO statements supported by the three wave models.

6.
Which test had the greatest up-and-down movement of the ring?
Question 6 options
7.

How much greater was the ring's up-and-down movement in Test Q than in Test P? centimeters

8.
Which comparison gives the clearest evidence that the waves made the ring move?
Question 8 options

Judge the exhibit model

Use the test evidence to evaluate claims and make a wave model.

9.
Sort each statement by whether it is direct evidence that waves moved the ring.
10.
For these tests, what happened when crest spacing changed from 8 centimeters to 4 centimeters while the wave height stayed the same?
Question 10 options
11.
A visitor labels Model A's wave height as 6 units because the crest is at 8 and the trough is at 2. Which correction is right?
Question 11 options
12.
Draw a model for a new wave pattern. Use a resting level of 5 units. Make each crest 4 units above the resting level and place neighboring crests 6 centimeters apart. Show at least two crests and one trough. Label the crest spacing.
13.
The team wants to test whether closer crest spacing affects the ring's movement while wave height stays the same. Which comparison is fairest?
Question 13 options
14.
Make a claim about how wave height affected the ring's up-and-down movement in Tests P and Q. Support your claim with both test measurements.
15.
The exhibit model shows a repeating wave but leaves out the ring. Explain what should be added to the model so it represents how the wave affected the ring. Use evidence from at least two tests.