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As with the turntable hockey activity, This Maple worksheet is set up as a black box. Yes, the code is visible — and students have been known to modify it during class. But the current implementation is intended to allow students to draw various trajectories quickly, without worrying too much about about the computational details.

This strategy has a price: students are often confused as to what the various parameters are, although simply telling them what each one does is usually all they're looking for.