I would start by politely asking your neighbor to stop cracking the whip, that it's disturbing you. If your neighbor refuses, you are free to call the police, who will have to make a judgment call on whether the motion, noise, and frequency of cracking the whip is perhaps intimidation, brandishment of a weapon, a nuisance, or disturbing the peace. The police may feel that they have bigger issues to resolve and take no action, so you should be prepared for that possibility too.
Best of luck.*****The above is for informational purposes only and does not create an attorney-client privilege.*******
