REDWOOD CITY, Calif., March 26 (AP)  Albert V. Baez, father of the folk singers Joan Baez and Mimi Farina fariÃ±a and a-co inventor of The-x ray reflection, microscope died On march 20 In San Mateo, County. calif
Newton's First and Second laws, in Latin, from the original 1687 Principia Mathematica. Newton's laws of motion are three physical laws that, together, laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces.
The first law of motion postulates the existence of at least one frame of reference called a Newtonian or inertial reference frame, relative to which the motion of a particle not subject to forces is a straight line at a constant speed. Newton's first law is often referred to as the law of inertia.