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Unformatted text preview: und when two balls strike each other. Perfectly elastic collisions do occur, however, between atomic
and subatomic particles. Elastic and perfectly inelastic collisions are limiting cases; most actual collisions
fall into a range between them.
We can summarize the types of collisions as follows:
• In an elastic collision, both momentum and kinetic energy are conserved.
In an inelastic collision, momentum is conserved but kinetic energy is not.
In a perfectly inelastic collision, momentum is conserved, kinetic energy is not, and the two
objects stick together after the collision, so their final velocities are the same. Finally, there are two tips that you can follow:
1. Momentum and Kinetic Energy in Collisions: The momentum of an isolated system is
conserved in all collisions. However, the kinetic energy of an isolated system is conserved only
when the collision is elastic.
2. Inelastic vs. Perfectly Inelastic Collisions: If the colliding particles stick together, the collision
is perfectly inelastic. If they bounce off each other (and kinetic energy is...
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