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CHAP TE R 1 General Concepts in Physics— Definition of Physical Terms 1.1 GRAVIT Y AND RELATED CONCEP TS Konstantin Tsiolkovsky, a pioneering Russian rocket scientist, once said that “The Earth is the cradle of Humanity, but we can not [sic] live in a cradle forever.” Mankind, in its process of evolu- tion, will eventually leave their home planet searching for new places to inhabit, just like our primi- tive ancestors did when they left their caves. Living organisms on Earth share at least one thing in common: all of them live under the influence of the gravitational force of the Earth, which produces an acceleration of approximately 9.81 m/s at mean sea level. Earth’s acceleration is represented by the small letter “g.” Therefore, any variation in this force will result in physiological changes in any given organism. To better understand topics related to the effects of hypergravity and microgravity on living organisms, it is important to be familiar with some definitions of physical terms, theories, and laws that will be presented and discussed in this chapter (Chandler; Cutnell and Johnson, 2006; Dobson et al, 2006; Halliday et al, 1993). Gravitation (or gravity) is the tendency of objects with
Published: Jan 1, 2008
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