1.   Einstein next considered the implications of the equivalence principle for motion in free fall, that is to say motion under gravitational forces alone.

2.   So for a sufficiently large number of matter particles, gravitational forces can dominate over all other forces.

3.   This is because the gravitational forces are appreciable over much larger distances than the non-gravitational forces.

4.   Weight is the gravitational force of attraction exerted on a body.

5.   Although a bit shaky from the transition back into a world of gravitational force, Glenn smiled broadly as he stepped slowly back onto earth.

6.   Although it survived, gravitational forces shattered it into several pieces.

7.   Although it is not definite yet, there are suggestions in some recent observations of supernova that there may be a repulsive gravitational force called the cosmological constant.

8.   An acceleration, if true, might indicate the presence of the constant acting against gravitational forces.

9.   As more and more hydrogen is drawn into such a cloud, it is compressed by gravitational force to high density, high pressure and high temperature.