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Linear Momentum of a Point Particle

المؤلف:  Professor John W. Norbury

المصدر:  ELEMENTARY MECHANICS & THERMODYNAMICS

الجزء والصفحة:  p 115

28-12-2016

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Linear Momentum of a Point Particle

A more fundamental way of discussing Newton's second law is in terms of a new quantity called momentum. It is defined as

and it is important because it is a conserved quantity just like energy. The proper way to write Newton's second law is

Now  if the mass is constant. Thus  if the mass is constant. (If the mass is not constant then  so that Newton's second law actually reads .