A primary astronomy .. . ts rapid motion,especially as every thing upon its surface, and the atmosphere by which it is sur-rounded, move onward with it in its rapid flight.] 216. What keeps the planets revolving so steadily in their orbits JIt is the result of two distinct influences, called the centripetal* and centrifugal\ forces. * Cek-trip-e-tal, from centrum, center, and peto, to move toward:tending to the center. f Cen-trif-c-gal, from centrum, and fugio : to fly from the center. fj^f In the above two cases we agree with Dr. Webster, that thecommon accentuation is artificial and harsh. T
A primary astronomy .. . ts rapid motion,especially as every thing upon its surface, and the atmosphere by which it is sur-rounded, move onward with it in its rapid flight.] 216. What keeps the planets revolving so steadily in their orbits JIt is the result of two distinct influences, called the centripetal* and centrifugal\ forces. * Cek-trip-e-tal, from centrum, center, and peto, to move toward:tending to the center. f Cen-trif-c-gal, from centrum, and fugio : to fly from the center. fj^f In the above two cases we agree with Dr. Webster, that thecommon accentuation is artificial and harsh. The accent on the first andthird syllables, as in Circumpolar, would be natural and easy. 48 PELMAEY ASTRONOMY. 217. What is the Centripetal Force? It is the mutual attraction of the Sun and planets,which prevents them from wandering off from the Sun. 218. Describe the Centrifugal Force. It is the tendency to fly off from the Sun, producedby the planets revolving around him. CENTRIPETAL AND CENTRIFUGAL FORCES. CENTRIFUGAL. [1. In the cut we have an arc of theEarths orbit. The attraction of the sun,shown by the line A B, is the centripetalforce, while the tendency to follow the lineC D, is the centrifugal force. The twocombining, give the planet what may becalled a resultant motion, in the directionC E; and as it meets no resistance in thevoid of space, it continues to revolve fromage to age. 2. If the centrifugal force were suspended,the planets would at once fall to the Sun;and if the centripetal force were destroyed,the planets would fly off in straight lines,and leave the Solar System forever. Then might be realized the chaos andconfusion of the poet: Let Earth unbalanced from her orbit fly,Planets and suns run lawless through the sky,Let ruling angels from their spheres be hurled,Being on being wreckd, and world on world.] 219. Why do the planets nearest the Sun revolve most rapidly ?Because the nearer the Sun the greater the attraction (206), and the more centrifugal force
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectastronomy, bookyear18
