This experiment simulates an air track (ie frictionless surface) with two blocks. You can set the initial velocity and mass of each block and then watch what happens! By setting the value of e to 1 you have an elastic collision, and a value of e=0 corresponds to an inelastic collision.
To thoroughly understand the material, try to predict final velocities, momenta, etc. Can you predict a situation in which one block will become motionless after the collision? Is kinetic energy (0.5*m*v*v) conserved during all collision? What about momentum (m*v)?