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King's College London Chapel 2, London - Diliff

wright011: wikiversity:User:Matthew Kuether

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Spring 2018 PHY2400

First Lab

We first got in a group to figure out how to use the LabQuest. Once we plugged the motion detectors into the lab quest we would hit the play button in the bottom right corner. The play button activated the motion detectors and then recorded the distance on a bar graph. We took turns moving the motion detector closer to the table and then farther away until we were able to make a decent looking parabola on the LabQuest plot.

wikiversity:Physics and Astronomy Labs/Uniform acceleration tapping basketball with spitwads

Spitwad Lab

hiding lab

Motion Detector Graph Matching

The group is Wsul011, Wsul026 and Wsul005.

What we did

Part One: We started by plugging the LabQuest in and hooked the motion detector into the LabQuest. We Then put a piece of paper in front of the motion detector and started collecting data. As the data was being collected we slowly moved the piece of paper away from the motion detector. We then put the piece of paper back in front of the motion detector and moved it away from the motion detector faster than the first time. We then compared the two graphs. The second time where we moved the piece of paper away faster had a high slope on the position vs. time graph and the velocity vs. time graph had a higher average magnitude.

Part Two: We opened the file 01b Graph Matching and the file 01c Graph matching. We tried to move the piece of paper back and forth from the motion detector in order to match the graph of the file that we opened. We repeated this process until we were able to successfully. I took us tow tries to match the graph.

Part Three: Part three was the same are part three but we tried to match velocity graphs instead of position graphs. We opened the file 01d Graph Matching and the file 01e graph matching. We then tried to match both of these graphs. We found that it was a lot harder to match a velocity graph than it was to match the position graph.

What you should do


Graphs are an easy way to look at position, velocity, and acceleration vs time. The motion detector uses sound wav pulses to measure the distance an object is away from it and the it creates graphs.


Connect the motion detector to the Labquest and set the motion detector to normal. Set the motion detector on a table and mark off every foot from the motion detector up to four feet. Start with a paper in front of the motion detector and have you partner hit the play button on the Labquest. When the play button is hit the motion detector will make a rapid clicking noise. When the noise starts move the paper away from the motion detector until you get to the four foot mark. Repeat the process with the paper but move it away from the motion detector faster. Then compare the two graphs. Then open the files 01b Graph matching and 01c Graph matching. By moving the paper back and forth from the motion detector try to match both of the position graphs in the files that you opened. Keep trying to match the graphs until you get a graph that looks like the ones you opened. Then open the file 01c Graph Matching and 01d Graph Matching. Try to match these velocity vs. time graphs by moving back and forth from the motion detector. Keep going until you are able to match the graphs.


1. How close was your first try to match the position graphs and the velocity graphs?

2. How did you know what direction and speed to move the paper from the motion detector?

3. Which one of these graphs were harder to match and why do you thing so?