Stella Model: Constant Velocity
| Table of Contents | |
| Page No. | Topic |
| Page 3 |
Kinematics and Dynamics: Overview, Skills Required, & EALRs |
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Page 4 |
Stella Model: Constant Velocity |
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Page 8 |
Stella Model: Acceleration Stella Model: Free FallPage |
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Page 12 |
Stella Model: Newton’s Laws of MotionPage |
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Page 16 |
AppendixPage |
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Page 20 |
Stella Model: Constant Velocity AnswersPage |
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Page 21 |
Stella Model: Acceleration AnswersPage |
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Page 23 |
Stella Model: Free Fall AnswersPage |
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Page 26 |
Stella Model: Newton’s Laws of MotionPage |
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Page 30 |
Assessment for Stella Modeling of Kinematics & DynamicsPage |
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Page 35 |
Assessment AnswersPage |
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Page 37 |
Scoring Rubric for AssessmentsPage |
| Page 39 | Links to Sites for STELLA Modeling |
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When the full screen appears, click on the icon of the world
It should change to an
. The top bar looks like this:
This is the source of the icons we will use to build our model.First click on the icon that looks like this :
.This is known as a stock Now slide your pointer out into the open field and click again.>A large stock should appear with the word Noname 1 highlighted.Before doing anything else, type the word Distance.
Now click on the icon which looks like this: 
.This is a flow.Slide your pointer to a position some distance to the left of the stock, click and drag until the arrow just touches the stock and the stock becomes shaded. Let go of the mouse button.Type the word Rate of Change of Distance. Your diagram should look like this:
To get rid of the question marks, double-click on the Distance stock.When that window opens, enter 0 (that’s a zero) and click on OK.Nextdouble-click on the Rate of Change of Distance flow.When that window opens, enter 7 and click on OK. What about units?>In physics, all values should be accompanied by units.STELLA can work with any system of units, so the 0 above could be zero feet or zero meters. Likewise, the 7 could be 7 feet per sec, or 7 meters per sec or 7 miles per hour.Unfortunately, STELLA cannot do the math if the numbers have units behind them.There are two ways we can deal with this.We can remember what units we are using or we can put the units in brackets (like this {}), for example 7 {m/s}. Add units to your numbers. Now go back to the menu bar and click on the graph icon, which looks like this:
.Slide your mouse pointer to a clear spot in the window and click again.A small graph icon should appear and immediately be replaced by a large gray graph.Double-click anywhere in this graph and a new window will open.In the top center of this window, you will see two boxes which look like the two on the next page:
Click on the word Distance, then click on the symbolRepeat for Rate_of_Change_of_Distance. The boxes would now look like this:
Click onOK.You should be back at Graph 1, with the word Distance in red at the top and Rate of Change of Distance in blue.From the top menu, Click and hold on the word Run, then without letting go of the mouse button, slide down to Run on the menu and click on it.Two lines should form on the graph. 1.Sketch the graph on the axes below.Identify which line is Distance and Rate of Change of Distance.
Note that there are two scales on the y-axis, one for Distance and one for Rate_of_Change_of_Distance.Lock the graph by clicking on the padlock in the lower left-hand corner of the graph window. Explain why the graph appears as it does.
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Close the graph window by clicking in the square in the upper left-hand corner.>Bring a second graph icon to a clear spot in the window and double-click to open it.SelectDistance and Rate_of_Change_of_Distance as the items to graph.To set the scale on Graph 2 to be the same as the scale on Graph 1, highlight Distance, click on the double-headed arrow to the right of the Selected box, and set Min to 0 and Max to 90 and press Set.Highlight Rate_of_Change_of_Distance, click on the double-headed arrow to the right, set Min to 0 and Max to 14 and press Set.Click OK. In the Distance stock, change the initial distance to 5.Run the model and double-click on Graph 2. Sketch the graph on the axes below. Describe the appearance of the graph and explain what ishappening to Distance Rate_of_Change_of_Distance. _____________________________________________________________________
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In the Distance stock, change the initial velocity to 0 and change the Rate_of_Change_of_Distance flow value to 3. Run the model and double-click on Graph 2.Sketch the graph on the axes below.Describe the appearance of each graph and explain what is happening toDistance and Rate_of_Change_of_Distance.
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Experiment with changing the Distance value in the stock and the Rate of Change of Distance value in the flow.Change one or both values in each experiment.