Collisions and Impulse.
I. In a perfectly elastic collision, both linear momentum and kinetic energy are conserved.
II. In an inelastic collision, linear momentum is conserved, but kinetic energy is not.
III. The coefficient of restitution (e) is zero for a perfectly inelastic collision (bodies stick together).
IV. The impulse provided by a surface during a collision is equal to the change in momentum of the striking body.
V. During a collision, the internal forces between bodies are impulsive and much larger than external forces like gravity.
