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Cemetech has posted a number of articles on TI's STEM Behind Hollywood initiative, starting with the first announcement of the project, and continuing with the overwhelmingly positive reception at T^3 and the first two-part activity, Zombie Apocalypse. For Cemetech Programming Contest #12, Lorenzo "Ordelore" Orders planned to port the Earth Impact! activity, as detailed in his contest topic. Unfortunately, after learning about the gravitational force equation that governs cosmological movement, he was forced to drop out of the contest. I was inspired by his code, and ended up starting from scratch to create a TI-84 Plus C Silver Edition version of Earth Impact!

In Earth Impact!, students learn about gravitational force while they work to keep an asteroid from striking the Earth. This port of the Earth Impact! activity brings the excitement and education of TI's STEM Behind Hollywood program to the TI-84 Plus C Silver Edition. Made for Doors CSE 8.1 or higher, it provides the same engrossing lessons about Newton's law of universal gravitation, density, force, and other STEM topic that the TI-Nspire activity provides. Besides the on-calculator activity itself, it includes thorough teacher notes and a student handout, both heavily adapted from TI's original material. We would love to hear your feedback in the attached topic if you use this activity in your own classroom, and we plan to soon port Zombie Apocalypse, Body of Evidence, and Science Friction! to the TI-84 Plus C Silver Edition. We tip our hats deeply to Texas Instruments and their hard work in creating the original material for this activity.

Download:
Earth Impact! STEM activity for the TI-84 Plus C Silver Edition

*bump* For the curious, I have uploaded a new version of the Earth Impact that incorporates bug fixes as well as optimizations developed for Zombie Apocalypse Part 1::
- Y-axes on graphs are no longer upside-down
- The calculator tool can now be launched from graph pages
- Full-screen background image data is now copied with a special embedded assembly stub that enables images to be drawn in (much faster) constant time.
  
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