Internal Energy = Kinetic Energy + Potential Energy
The Kinetic Model describes how all substances are made up of atoms or molecules arranged differently.
Solids - atoms or molecules regularly arranged and closely packed together. Has strong electrostatic forces of attraction and can vibrate in their fixed positions around simple harmonic motion. Low Internal Energy,
Liquids - atoms or molecules are still very close together, Has more kinetic energy than a solid and can change position as the flow past each other. Medium Internal Energy,
Gases - atoms or molecules have lots of kinetic energy and free to move past each other. Gases have no electrostatic forces.
Elastic collisions are collisions when total momentum and kinetic energy is conserved.
Inelastic collisions are when kinetic energy is not conserved.
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