# Newton's laws of motion

(redirected from Newton's third law)
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

## 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).

## law

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 ?
Difficulties with Newton's third law in general have been described many times in the literature, over at least three generations (Lindsay, 1943; Brown & Clement, 1987; Brown, 1989; Hellingman, 1992; Wilson & Low, 2015).
Learning about Newton's Third Law should inspire imaginative thinking in your students, because there are so many examples of the principle at work all around us.
Over the past 35 years, health and safety has become embedded into our culture anyway, and the chance of a reversal of Newton's third law to pre-1974 working conditions is unlikely.
Hmm, the HyperSonic technology and the powder being used may help to moderate Newton's third law of motion, but I did run some numbers of what level of recoil is delivered by 1-3/8 ounces of steel shot at a common industry velocity of 1,450 fps and then at 1,700 fps.
Back when I took college physics, I learned Newton's Third Law of Motion: Every action has an equal and opposite reaction.
For every action in the physical world, there is an opposite and equal reaction, or so Newton's third law suggests, and the property industry is no exception to the rule.
audacious plan is based on Newton's Third Law, which, as any schoolboy will tell you, states that for every action there is an equal and opposite reaction.
Then there's Newton's Third Law of Motion, which states that "for every action there is an equal and opposite reaction.
It came gradually over decades of studying the book and finding one thing for certain: Scripture is like Newton's third law of motion--for every action there is an equal and opposite reaction.
Newton's Third Law is in full swing: The increasingly visible, politically potent surge in American religiosity has prompted an equal and opposite reaction by hitherto quiescent unbelievers.
Since I still had an armpit full of collective, I was reminded of Newton's third law, "For every action, there is an equal and opposite reaction.
NEWTON'S Third Law tells us, "For every action, there is an equal and opposite reaction.

Site: Follow: Share:
Open / Close