# Newton's third law

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## Newton's third law

[′nüt·ənz ′thərd ′lȯ]
(mechanics)
The law that, if two particles interact, the force exerted by the first particle on the second particle (called the action force) is equal in magnitude and opposite in direction to the force exerted by the second particle on the first particle (called the reaction force). Also known as law of action and reaction; third law of motion.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Some would argue that the normal force can be the Newton's third law reaction to weight, if an operational definition of weight (essentially 'what a scale reads', or what might be called load in engineering) is being used instead of the gravitational definition (W = [F.sub.g] = [m.sub.g]).
* View an explanation of Newton's Third Law at: http://studyjams.scholastic.com/studyjams/jams/ science/forces-and-motion/action-and-reaction.htm
Newton's third law of motion famously explains that the force interaction between two objects is always equal and opposite.
All aircraft depend on Newton's Third Law, which states that every action has an equal and opposite reaction, and on Bernoulli's Principle, which examines pressure differentials.
For example, I can still remember Isaac Newton's Third Law of Motion, relating to inertia (I knew all about inertia).
Newton's Third Law: Every force has an equal and opposing force
Bernoulli's Principle and Newton's Third Law of Motion are the main scientific principles that explain the phenomena necessary to accomplish both atmospheric, wing/ foil-based and outer space flight.
According to Newton's third law of motion, "for every action there is always an equal and opposite reaction." Geopolitics has a similar law: whenever the world sees a new emerging power, the world's greatest existing power tries, directly or indirectly, to block its rise.
The most surprising example of scientific inaccuracy in Astronautics is his apparent misunderstanding of Newton's third law of motion: for every action, there is an equal and opposite reaction.
Newton's third law for enjoying a festival is to know where you'll be sleeping.
He said his work was in response to Newton's third law that stated, "For every action there is an equal and opposite reaction." He also said there were situations in life that made him pursue a path, which he was unwilling to take otherwise.
Action and reaction, Lydia thought, yet another example of Newton's third law of motion.

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