Engine in thrust. Particularly notable kinds of engines include: Engine An engine or motor is a machine designed to convert one form of energy into mechanical energy. Heat engines burn a fuel to create heat which is then used to do work. Internal combustion engines are heat engines that burn fuel in a combustion chamber to extract work from the pressure of expanding gases. Electric motors convert electrical energy into mechanical motion; pneumatic motors use compressed air; and clockwork motors in wind-up toys use elastic energy. In biological systems, molecular motors, like myosins in muscles, use chemical energy to create forces
Potential energy of protein apart. The potential energy contribution of this interaction is defined over S, set of atoms with van der Waals interaction, as: E = Σ ε [ (σ/r) - 2(σ/r)] where: r distance between atoms σ distance at Van der Waals energy is minimum Potential energy of protein Internal potential energy of a molecule in molecular mechanics is described by a system of functions known as forced field. The potential energy usually includes several terms: E = E+ E+ E + E +E When two atoms are connected by a chemical bond, they tend to maintain a fixed distance. The fixed