Nothing much... Just a test to see how the block would change its direction according to the ground. This could be useful in platformer games... May I warn you, it's a bit buggy... I've made a ball physics test with this script: https://scratch.mit.edu/projects/200418873/
Trigonometry Other projects: Data converter: https://scratch.mit.edu/projects/196384770/ distance and angle using (x,y): https://scratch.mit.edu/projects/200421403/