Impulse: This is a measure of how much a force changes an object's motion. It's like giving a big push to start a swing moving.
Inelastic Collision: A type of collision in which kinetic energy is not conserved but momentum is conserved. It's like when two pieces of clay collide and stick together - they move as one after impact.
Elastic Collision: A type of collision where both kinetic energy and momentum are conserved. It's like when two billiard balls collide - they bounce off each other without losing any energy.