Motion Graphs
Time vs. Distance Graphs
We will be testing the following hypotheses about Time vs. Distance Graphs:
• The slope of the Time vs. Distance Graph is the velocity, so :
1. Constant velocity makes a constant slope
2. The faster the velocity the steeper the slope
3. Speeding up makes a graph that curves upward, getting steeper
4. Slowing down makes a graph that flattens out
5. The actual velocity can be calculated by finding the slope of the line
Velocity average = [pic] Slope = [pic]
Test 1 (Do as class)
To open the graph you need for this: 1. Open the file folder icon., 2. Open the folder “Physics with Computers” 3. Open the Folder “01a Graph Matching”
Click on collect and walk slowly away from the computer at a constant rate. Sketch your graph below. It’s alright to let several people try this until you get a good, smooth graph. When you sketch it be sure to ignore the little wiggles and focus on the” big “, important behavior.
| | Choose two points off the graph and calculate the speed of the |
| |runner. Label the two points on your graph and show your work |
| |for your calculation. |
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In words, describe what this graph is showing. Use your speed/slope to make your description more specific.
Test 2
Save a good slow walk graph by going to the EXPERIMENT drop down menu and choosing “Store Latest Run” .
Now click on collect and walk quickly away from the computer at a constant rate. Sketch both your lines on the graph below. It’s alright to let several people try this until you get a good, smooth graph. When you sketch it be sure to ignore the little wiggles and focus on the” big “, important behavior.
| |Perform a calculation to find the speed of the new walk. Label |
| |your points on the graph and show your work. |
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Did this graph and calculation support the hypotheses listed at the beginning of the handout?
Explain how.
Test 3
Get rid of the old graphs by going the DATA drop down menu and choosing “Hide Run”.
Now click on collect and speed up as you walk away from the computer. Start pretty slow for this. Sketch your lines on the graph below. It’s alright to let several people try this until you get a good, smooth graph. When you sketch it be sure to ignore the little wiggles and focus on the” big “, important behavior.
| |Get your teacher to show you how to use the computer to find the |
| |slope of the line as it changes. Record some of the values |
| |below. |
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| |Beginning Velocity |
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| |Ending Velocity |
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| |Average Velocity |
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Use the distance and time at the very beginning of the motion and at the very end of the motion to calculate the average velocity over the entire part of the graph where you were moving.
Beginning point. t1 =_________s d1 = __________m
Ending Point t2 = __________s d2 = _______m
Calculation for average velocity: (box final answer)
How does your average velocity compare with the value the computer gave? (If they’re not similar find your mistake.)
Test 4
Get rid of the old graphs by going the DATA drop down menu and choosing “Hide Run”.
Now click on collect and slow down as you walk away from the computer. Start pretty fast for this. Sketch your line on the graph below. It’s alright to let several people try this until you get a good, smooth graph. When you sketch it be sure to ignore the little wiggles and focus on the” big “, important behavior.
| |Use the computer to find the slope of the line as it changes. |
| |Record some of the values below. |
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| |Beginning Velocity |
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| |Ending Velocity |
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| |Average Velocity |
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Use the distance and time at the very beginning of the motion and at the very end of the motion to calculate the average velocity over the entire part of the graph where you were moving.
Label your beginning and ending points on the graph.
Calculation for average velocity: (box final answer)
How does your average velocity compare with the value the computer gave? (If they’re not similar find your mistake.)
When you are finished test your skill at trying to match some graphs on the computer. To open the files you need for this: 1. Open the file folder icon., 2. Open the folder “Physics with Computers” 3. Open the Folder “01b Graph Matching” or “01c Graph Matching”
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Distance (m)
Time (s)
Distance (m)
Time (s)
Distance (m)
Time (s)
Distance (m)
Time (s)
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