牛顿

• a force of 1 newton gives an acceleration of 1m/s a mass of 1kg.
  一牛顿的力给予一千克重量的物质以1米的加速度。
• Newton's laws are meaningless equations until we know how to apply them .
  倘若我们不知道怎样应用牛顿定律，这些定律就会是一些没有意义的方程。
• Newton's first two laws hold only when observed in unaccelerated reference frames .
  牛顿第一、第二定律只有在非加速的参照系中作观察时才是成立的。
• The process described in this section is a generalization of newton's method for a single equation .
  本节所叙述的是对单个方程的牛顿方法的一般化。
• The operation of differentiation was first systematized by newton(1642-1727)and leibnitz .
  微分的计算最早是由牛顿（1642-1727）和莱布尼兹加以系统化的。
• In the preceding chapter, the concepts of work and energy were developed from newton's laws of motion .
  在前一章里，功和能的概念是由牛顿运动定律发展来的。
• Newton's second law applies separately to every part of a system or any combination of parts .
  牛顿第二定律可分别应用到系统的每个部分或几个部分的任意组合。
• Newton's problem was to express in mathematical terms the gravitational force between different bodies .
  牛顿的目标是要用数学形式来表示不同物体之间的引力。
• In this section we depart briefly from the subject of newton's laws to discuss the question of units .
  在这一节中，我们暂时离开牛顿定律来讨论一下单位问题。