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Sir Isaac Newton made several key contributions to our understanding of forces. For instance, some of the basic rules about forces are summarized by Newton’s laws of motion, so we will devote some time to understanding what these laws are all about and how they are applied in various situations.
Three of the laws that Newton stated in The Principia form the basis for dynamics and are known simply as Newton’s Laws of Motion. In kinematics, we discovered the nature of how objects move, but there still existed the question of why objects move the way they do.
Isaac Newton (British, 1642-1727) first figured out the precise relationship between forces and motion “... for in those days I was in my prime of age for invention.” Newton's First Law (NI): If the net force acting on an object is zero, then it has constant velocity. F 0 v constant net Newton's Second Law (NII): F m a net
Newton’s first law states that when no net force acts on an object, it stays at rest or in motion with a constant velocity. The second law tells us what happens when this force is not zero. Newton used the word “motion”' to mean what we nowadays call momentum.
This book presents a single semester course on Newtonian dynamics that is intended primarily for upper-division (i.e., junior and senior) undergraduate students majoring in physics. A thorough understanding of physics at the lower-division level, including a basic working knowledge of the laws of mechanics, is assumed. It is also taken for ...
Newton’s 1st Law: Every body continues in its state of rest, or of uniform motion in a right (straight) line, unless it is compelled to change that state by forces impressed upon it.
We have introduced Newton's 3 Laws. Laws are statements which are true always. There are no derivations of Newton's Laws; in particular there is no derivation of F net = m a. These laws are taken as assumptions or axioms of the theory of Newtonian mechanics. We believe these laws
