We’ve covered thermal, bond, kinetic, gravitational, and elastic energies, fitting into two categories: potential and kinetic. The Energy-Interaction Model treats thermal and mechanical interactions e...We’ve covered thermal, bond, kinetic, gravitational, and elastic energies, fitting into two categories: potential and kinetic. The Energy-Interaction Model treats thermal and mechanical interactions equally, even with friction. Microscopically, energy can convert between forms, though thermal energy has limits. Next, we’ll use particle models to understand matter and connect to thermodynamics. The model doesn’t cover interaction details, which Newton's Laws address.