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SAT2物理词汇术语整理18

2019-10-02 22:14:18来源:网络

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  The following list defines all of the bold-faced words you encountered as you read this book.

  N

  Neutrino

  An almost massless particle of neutral charge that is released along with a beta particle in beta decay.

  Neutron

  A neutrally charged particle that, along with protons, constitutes the nucleus of an atom.

  Neutron number

  The number, N, of neutrons in an atomic nucleus.

  Newton

  A unit of force: 1 N is equivalent to a 1 kg · m/s2.

  Newton’s First Law

  An object at rest remains at rest, unless acted upon by a net force. An object in motion remains in motion, unless acted upon by a net force.

  Newton’s Law of Universal Gravitation

  The force of gravity, F, between two particles of mass and , separated by a distance r, has a magnitude of , where G is the gravitational constant. The force is directed along the line joining the two particles.

  Newton’s Second Law

  F = ma. The net force, F, acting on an object causes the object to accelerate, a. The magnitude of the acceleration is directly proportional to the net force on the object and inversely proportional to the mass, m, of the object.

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