physics collisions

newtons 2nd law

the rate of change of momentum of a body is proportional to the net force acting on it, and direction of momentum change is in the direction of the net force

impulse

the product of the average force acting on an object and the duration of time for which the force acts

change in momentum of the body

principle of conservation of linear momentum

the total linear momentum of a system will remain constant if no external force acts on it

head on collisions

the line of impact passes through the centres of gravity of both bodies. the velocities of colliding bodies are collinear before and after impact

elastic collision

the total kinetic energy is conserved before and after the collision

inelastic collision

total kinetic energy is not conserved before and after the collision

perfectly or completely inelastic collision

total kinetic energy of the colliding bodies is not conserved before and after the collision, colliding bodies stick together after the collision, common final velocity