remove the option for "include gravity" from physics apps

[AlanRosenthal]

@fgmart @ivanrudnicki

We should remove the option for adding/removing gravity from physics apps. It's slightly confusing and endusers don't fully understand what it means. It should just be regular acceleration (gravity included).

[bdonald25]

When would acceleration including gravity be more useful than acceleration without gravity? I found it hard to interpret the data from Canobie that included gravity because the phones were constantly changing orientation.

If a user is accelerating in a horizontal line, at 10m/s, it makes sense for the magnitude to show 10 m/s. If gravity is included the value, it is now 19.8 m/s. If the user was accelerating up at 10 m/s the magnitude would show 0.2 m/s. (10 up and 9.8 down would cancel out).

When you would want the magnitude to be 0.2 in that situation instead of 10 m/s? 10 is the users total acceleration not 0.2.

[Rajia]

Having gone on the canobie field trip with Bobby I completely agree. The data is a lot easier for the students to comprehend without taking into account gravity.

Rajia

On Jun 29, 2014, at 12:54 PM, "bdonald25" <[email protected]mailto:[email protected]> wrote:

When would acceleration including gravity be more useful than acceleration without gravity? I found it hard to interpret the data from Canobie that included gravity because the phones were constantly changing orientation.

If a user is accelerating in a horizontal line, at 10m/s, it makes sense for the magnitude to show 10 m/s. If gravity is included the value, it is now 19.8 m/s. If the user was accelerating up at 10 m/s the magnitude would show 0.2 m/s. (10 up and 9.8 down would cancel out).

When you would want the magnitude to be 0.2 in that situation instead of 10 m/s? 10 is the users total acceleration not 0.2.

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