Newtons laws
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[edit] Newton's first law of motion
If no external force acts on a particle, then it is possible to select a set of reference frames, called inertial reference frames, observed from which the particle moves without any change in velocity.
[edit] In Latin
- Lex I: Corpus omne perseverare in statu suo quiescendi vel movendi uniformiter in directum, nisi quatenus a viribus impressis cogitur statum illum mutare. Principia Mathematica.
[edit] Newton's second law of motion
\[\left. F \right.=ma\]
Where \(F\) is the force, \(m\) is the mass and \(a\) is the acceleration. This law has been found to be true for accelerations as small as \(5 \times 10^{-14} m/s^2\) (Ref. 2)
[edit] In Latin
- Lex II: Mutationem motus proportionalem esse vi motrici impressae, et fieri secundum lineam rectam qua vis illa imprimitur. Principia Mathematica.
[edit] Interesting reading
- Frank Wilczek "Whence the Force of F = ma? I: Culture Shock", Physics Today October pp. 11-12 (2004)
- Frank Wilczek "Whence the Force of F = ma? II: Rationalizations", Physics Today December pp. 10-11 (2004)
- Frank Wilczek "Whence the Force of F = ma? III: Cultural Diversity", Physics Today July pp. 10-11 (2005)
[edit] References
- Adrian Cho "No Twisting Out of Newton's Law", ScienceNOW Daily News 13 April 2007
- J. H. Gundlach, S. Schlamminger, C. D. Spitzer, K.-Y. Choi, B. A. Woodahl, J. J. Coy, and E. Fischbach "Laboratory test of Newton's second law for small accelerations", Physical Review Letters 98 150801 (2007)
[edit] Newton's third law of motion
Whenever A exerts a force on B, B simultaneously exerts a force on A with the same magnitude in the opposite direction.
[edit] In Latin
- Lex III: Actioni contrariam semper et æqualem esse reactionem: sive corporum duorum actiones in se mutuo semper esse æquales et in partes contrarias dirigi. Principia Mathematica.
