Newtonian Mechanics Newtonian Mechanics Newton's first law defines a class of inertial frames. Let F ik be the force that particle i exerts on particle k . Newton's laws are well suited for the study of unconstrained mechanical systems. Constraints , such as requiring a particle to follow a given curve in space, tell us that there are external forces, but do not tell us what these forces are. The forces are only known in terms of their effect on the motion.
Conservation laws are very important tools in solving mechanics problems.