This project is a simulation of how a population of 10 red dots can leave their home circle according to how much impulse they have. The rules they live by are quite simple: advance a random distance (5, impulse+5) and turn a random number of degrees (-5,5), whenever a red dot finds another a 180 degrees turn is made. These simple rules lead to strange behavior (have you ever tried to avoid someone just to find her everywhere up to the point people think you like to be together? that's exactly what happens to the dots sometimes!) Set impulse to 1 to see them take a long time to abandon the circle. Set it to 10 and things go fast. 5 is a good number.
This project was inspired in a previous one I made: http://scratch.mit.edu/projects/3055186/ only this time sprites are vectored and the simulation calculates the time it takes for the dots to leave a home circle.