Inelastic collisions occur when two objects collide and do not bounce apart completely. Instead, they stick together or deform, resulting in a loss of kinetic energy. This energy is transformed into other forms, such as heat or sound, making the total kinetic energy after the collision less than before. In these types of collisions, momentum is still conserved, meaning the total momentum of the system before the collision equals the total momentum after. Common examples of inelastic collisions include car accidents, where vehicles crumple upon impact, and sports like football, where players collide and may fall together.