Newton's laws of motion

(redirected from Newton's laws)
Also found in: Dictionary, Encyclopedia.

Newton's laws of motion

three laws that relate the forces and motions of bodies or objects (from the viewpoint of a fixed observer), first proposed by Isaac Newton. (1) An object will remain at rest or continue with constant velocity unless acted on by an unbalanced force. (2) The rate of change of momentum (or acceleration for a body/object of constant mass) is proportional to, and in the same direction as, the force applied to it (force = mass ×1 acceleration). (3) When two objects are in contact, the force applied by one object on the other is equal and opposite to that of the second object on the first (for every action, there is an equal and opposite reaction).


principle or rule
  • Davis' law soft tissues' tendency to shorten and contract unless subject to frequent stretching

  • Hilton's law a joint and its motive muscles (+ insertions) are all supplied by the same nerve

  • Hook's law tissue strain (i.e. change in length) is directly proportional to applied compressive or stretching stress, so long as tissue elasticity (recoil ability) is not exceeded

  • inverse-square law radiation intensity is inversely proportional to square of distance from radiation source (rad = κ1/cm2)

  • law of excitation muscle tissue contracts in direct proportion to stimulating current strength

  • Newton's first law; law of inertia an object at rest will not move until acted upon by a force; an object in motion will remain in motion at constant velocity until acted on by a net force

  • Newton's second law; law of acceleration acceleration is directly proportional to applied force and indirectly proportional to object mass (i.e. force = mass × acceleration)

  • Newton's third law; law of reciprocal actions to every action there is an equal and opposite reaction; i.e. a body is maintained at rest by equal and opposing forces

  • Pascal's law a fluid at rest transmits pressure equally in every direction

  • Poiseuille's law vascular blood flow is inversely proportional to fourth power of vessel radius (i.e. the narrower the vessel, the greater the resistance to flow)

  • Starling's law the greater the stretch imposed on a circular muscle (e.g. muscle layer of an artery), the greater its reciprocal recoil and contraction

  • Wolff's law bone function changes cause bone structure modification (see bone modelling)

Mentioned in ?
References in periodicals archive ?
Is there a need to involve extra entities (dark matter) or to modify forcibly the fundamental Newton's law to explain of this and others cosmological effects?
To attract these potential customers, be sure to include Newton's laws of motion in the advertisement copy.
Principia Mathematica by Sir Isaac Newton (1687) - Often held to represent the peak of the scientific revolution, it includes Newton's Laws of Motion.
Teaching 12-17-year-olds the joys of Newton's Laws as well as football, cricket and rugby.
It can make science more interesting in a classroom environment where it is useful for physics teachers when teaching their students Newton's laws of motion.
In structure, a DPD algorithm looks much like molecular dynamics (MD), where atomistic particles move according to Newton's laws.
That of physics is oriented to classical applied physics in curses of general physics, thermodynamics theory, thermotechnics, classical mechanics (statics/dynamics being stated directly from Newton's laws in mechanics with brief introductory guides to rational Lagrangian formulation and quantum mechanics), electromagnetic and electrical engineering.
Newton's laws could be used to predict what would happen to two arbitrary bodies anywhere in the universe.
To prepare, Fishel says eighth-graders last year were taught experiential physics, including Newton's laws of physics.
NEW YORK-It's one of Newton's laws of physics: When -- not if -- you get a stain on your carpet, it will be in the most visible place.
Yet, next to Fly, they look like exercises: ones that test but never break Newton's laws.
Instead of the solid and stable system embodied by Newton's laws, the new sciences describe a world of chaos, discontinuous change and powerful relationships.