# Newton's laws of motion

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## 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)

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We also have to keep in mind Newton's Third Law of Motion.
Newton's third law of motion has an analog in the realm of public policy, law, and politics.
The head of the Gujarat state administration, Narendra Modi, passed off the Hindu retaliation as evidence of Newton's Third Law of Motion, which says that for every action there is an equal and opposite reaction.
ACCORDING to Newton's Third Law of Motion, for every action there's an equal and opposite reaction.
Unfortunately when Newton's third law of motion is applied to the growth of e-commerce in the European Union, the reaction is the increase of credit card fraud.
The relevant scientific principle is Sir Isaac Newton's third law of motion - the law of reaction.
For those who don't hold a degree m aeronautical engineering, this phenomenon is explained through such physics principles as the Venturi Effect, Bernoulli's Law and Newton's Third Law of Motion.

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