Collider contains a physical model of the interaction of bodies. Using the settings, you can set various initial states of the system, control the properties of the balls and the environment, such as the elasticity of balls and walls, gravity, etc. The application is a good visual aid for those who want to understand the laws of conservation of energy and momentum, and can also be used as anti stress.
The application is constantly being developed and supplemented. Share your opinion in the comments about what you would like to add to the application.