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SAT2物理词汇术语整理19

2019-10-02 22:14:34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.

  Newton’s Third Law

  To every action, there is an equal and opposite reaction. If an object A exerts a force on another object B, B will exert on A a force equal in magnitude and opposite in direction to the force exerted by A.

  Node

  The points on a standing wave where total destructive interference causes the medium to remain fixed at its equilibrium position.

  Normal

  The line perpendicular to a surface. There is only one normal for any given surface.

  Normal force

  The reaction force of the ground, a table, etc., when an object is placed upon it. The normal force is a direct consequence of Newton’s Third Law: when an object is placed on the ground, the ground pushes back with the same force that it is pushed upon. As a result, the net force of an object on the ground is zero, and the object does not move.

  Nuclear fission

  A nuclear reaction in which a high-energy neutron bombards a heavy, unstable atomic nucleus, causing it to split into two smaller nuclei, and releasing some neutrons and a vast amount of energy at the same time.

  Nuclear fusion

  A nuclear reaction that takes place only at very high temperatures. Two light atoms, often hydrogen, fuse together to form a larger single atom, releasing a vast amount of energy in the process.

  Nucleus

  The center of an atom, where the protons and neutrons reside. Electrons then orbit this nucleus.

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