Acting • Alternative • Applies • Based • Basic • Between • Calculate • Conservation • Deals • Defines • Describing • Displacements • Does • Employs • Energies • Energy • Equal • Fewer • Focuses • From • Function • Independent • Isaac • Lagrangian • Least • Maximum • Meant • Mechanical • Motion • Motions • Object • Parameters • Particle • Polar • Possible • Principle • Quantities • Relativistic • Restrictions • Simplifies • States • Stationary • Study • System • Systems • Total • Upon • Virtual • Where • Zero