| 1. | Inertial forces and gravitational forces are indistinguishable .
惯性力与引力是不可区分的。 |
| 2. | Under the action of universal gravitational forces the small perturbations will grow .
在万有引力的作用下，小扰动会加强。 |
| 3. | Each mass is subject to two forces, namely the tension of the string and the gravitational force .
每一个物体受到两个力，即细绳的张力和重力作用。 |
| 4. | Let us trace out in greater detail this computation of acceleration due to gravitational forces .
让我们详细追查这些由重力所引起的加速度的计算方法。 |
| 5. | 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。 |
| 6. | A bohr atom is a solar system in miniature, with electrical forces taking the place of gravitational forces .
玻尔的原子模型是太阳系的缩影，不过以电力替代万有引力。 |
| 7. | The idea of an inverse-square law of gravitational force acting on the planets was in the air around newton's time .
认为作用于行星的是平方反比定律的引力，这种看法在牛顿时代很流行。 |
| 8. | In his monumental work begun in 1666, newton discovered three vital facts about the gravitational force .
牛顿在他开始于一六六六年的不朽的工作中，发现了有关万有引力的三个极其重要的事实。 |
| 9. | The addition of matter over this critical value would lead to the collapse of the star without limit because of the ever-increasing gravitational forces .
质量超过临界值时，增加着的引力将造成恒星的无限坍缩。 |
| 10. | The "weightless" condition of astronauts in orbit about the earth arises from just this cancellation of inertial and gravitational forces .
在围绕地球运转的轨道中，宇航员的“失重”状态就是惯性力与引力相互抵消的结果。 |
