Algodoo

Nicely done. The scene is interesting and educational.

Thanks. Most of the credit goes to T_Reißig. I just improved the accuracy and added the formulas.

Thanks for uprading my scene!
The gear actually rotating looks way better than my clunky teleporting teeth. Also nice, that you took the time to go through the formulas.

How exactly did you create the gear though?

Q: How did you create the gear?
A:
1. Make ring by subtracting small circle from big circle.
2. Rotate and cut the ring in 15° increments.
3. Delete every other segment of the ring to make the gear.
4. Create a small circle inside the ring.
5. Glue circle and teeth together.
6. Add a hinge to the center of the circle.
7. Motorize the hinge.

Thanks!