Tagged With "Backspin"

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Shot Arc and Backspin

DAug ·
Has anyone in the forum worked on measurement of Shot Arc and/or Backspin for a foam ball (basketball) with a PocketLab inside?
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Re: Shot Arc and Backspin

Robby ·
Thanks for your question. The Projectile Speed graph can be a little tricky. The PocketLab calculates speed using just the accelerometer and the application is meant for projectile motion experiments. If you place the PocketLab sensor inside a ball and throw it up in the air and then catch it, you can approximately measure the projectile speed. However, you'll want to zero the graph right before you throw as small amounts of noise in the accelerometer can cause drift. In the case of your...
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Re: Shot Arc and Backspin

Robby ·
Great! Glad that lesson was able to help in some way. In terms of measuring the angle when the ball hits the basket, there isn't really a way to do that with the sensors. My suggestion would be to take video of the shot (if you're using iOS or Android you can use the video function in the app) and then measure the angle by analyzing the video. Exporting data as a .csv should work from the two-graph mode in the same way it works in the one-graph mode. It would just export two files. Let me...
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Re: Shot Arc and Backspin

DAug ·
Hi Robby, I have several follow-up questions/notes: (1) In single-graph mode, I Share Data by exporting to Dropbox (Save to Dropbox appears in the bottom row of options). In two-graph mode, that option is not presented. I have found that I can share two-graph mode CSVs with AirDrop, however, so I'm using AirDrop-to-Mac-to-Dropbox to get the file where I need it. (2) Is there documentation about the role of the Acceleration Scalar (g)? I would like to understand how to use it with the...
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Re: Shot Arc and Backspin

Robby ·
Great! Thanks for the questions. 1) Let me look into that and get back to you. It could be an odd setting in iOS. Another good app to share CSV files on iOS is the Notes app. You can save the CSV and add a title or a note like "Trial 1" right when you save it. 2) Good question! We currently don't have anything posted, but that's good feedback. For now, here is a quick explanation: The acceleration scalar graph is the resultant of all three axes -1g to offset gravity (this allows the...
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Re: Shot Arc and Backspin

DAug ·
(4) Also, is there any way to calibrate the PocketLab sensors, e.g., calibrate the accelerometer to 0,0,0 ?
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