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Newton's First and Second laws, in Latin, from the original 1687 edition of the Principia Mathematica.


Newton's laws of motion are three physical laws which provide relationships between the forces acting on a body and the motion of the body, first compiled by Sir Isaac Newton. Newton's laws were first published together in his work Philosophiae Naturalis Principia Mathematica (1687). The laws form the basis for classical mechanics. Newton used them to explain many results concerning the motion of physical objects. In the third volume of the text, he showed that the laws of motion, combined with his law of universal gravitation, explained Kepler's laws of planetary motion.
Briefly stated, the three laws are:

1. An object in motion will remain in motion unless acted upon by a net force.
2. Force equals mass multiplied by acceleration.
3. To every action there is an equal and opposite reaction.

Contents

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• <LI class=toclevel-1>1 The statements of the laws
  • <LI class=toclevel-2>1.1 Newton's first law: law of inertia <LI class=toclevel-2>1.2 Newton's second law: law of acceleration
  • 1.3 Newton's third law: law of reciprocal actions
  <LI class=toclevel-1>2 Importance and range of validity <LI class=toclevel-1>3 Relationship to the conservation laws <LI class=toclevel-1>4 See also <LI class=toclevel-1>5 References
• 6 External links

[edit] The statements of the laws

Newton's laws of motion describe the acceleration of massive objects. The modern understanding of Newton's three laws of motion is that,,:
First Law If no net force acts on a particle then the particle moves without any change in velocity (When observed from a set of reference frames, called inertial reference frames). Second Law (When observed from a set of reference frames, called inertial reference frames) The net force on a particle is proportional to the time rate of change of its linear momentum. Momentum is the product of mass and velocity. (This law is often stated as F = ma (the force on an object is equal to its mass multiplied by its acceleration).

*Third Law Whenever a particle A exerts a force on another particle B, B simultaneously exerts a force on A with the same magnitude in the opposite direction, these two forces act along the same line.

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*Isn't this an equal and opposite reaction?

Best regards,
- RP
http://forums.delphiforums.com/EinsteinGroupie