A Quote by Isaac Newton
If a projectile were deprived of the force of gravity, it would not be deflected toward the earth but would go off in a straight line into the heavens and do so with uniform motion, provided that the resistance of the air were removed.
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But although the attractive virtue of the earth extends upwards, as has been said, so very far, yet if any stone should be at a distance great enough to become sensible compared with the earth's diameter, it is true that on the motion of the earth such a stone would not follow altogether; its own force of resistance would be combined with the attractive force of the earth, and thus it would extricate itself in some degree from the motion of the earth.
For the elements have the property of moving back to their place in a straight line, but they have no properties which would cause them to remain where they are, or to move otherwise than in a straight line. The rectilinear motions of these four elements when returning to their original place are of two kinds, either centrifugal, viz., the motion of the air and the fire; or centripedal, viz., the motion of the earth, and the water; and when the elements have reached their original place, they remain at rest.
Therefore the solid body of the earth is reasonably considered as being the largest relative to those moving against it and as remaining unmoved in any direction by the force of the very small weights, and as it were absorbing their fall. And if it had some one common movement, the same as that of the other weights, it would clearly leave them all behind because of its much greater magnitude. And the animals and other weights would be left hanging in the air, and the earth would very quickly fallout of the heavens. Merely to conceive such things makes them appear ridiculous.
The natural law of inertia: Matter will remain at rest or continue in uniform motion in the same straight line unless acted upon by some external force.
The same thing is to be understood of all bodies, revolved in any orbits. They all endeavour to recede from the centres of their orbits, and were it not for the opposition of a contrary force which restrains them to and detains them in their orbits, which I therefore call Centripetal, would fly off in right lines with a uniform motion.
The moon gravitates towards the earth and by the force of gravity is continually drawn off from a rectilinear motion and retained in its orbit.
And yet, just as our body would burst asunder if the pressure of the atmosphere were removed from it, so would the arrogance of men expand, if not to the point of bursting then to that of the most unbridled folly, indeed madness, if the pressure of want, toil, calamity and frustration were removed from their life. One can even say that we require at all times a certain quantity of care or sorrow or want, as a ship requires ballast, in order to keep on a straight course.
If the earth were not round, heavy bodies would not tend from every side in a straight line towards the center of the earth, but to different points from different sides.
I do not believe in eternal progress, that we are growing on ever and ever in a straight line. It is too nonsensical to believe. There is no motion in a straight line. A straight line infinitely projected becomes a circle. The force sent out will complete the circle and return to its starting place.
If only gravity were working, the path would be symmetrical, it is the wind resistance that produces the tragic curve.
An object in motion tends to remain in motion along a straight line unless acted upon by an outside force.
It hit me that an Apache resistance would be a wonderful, you know, it would be a wonderful metaphor for Jewish-American soldiers to be using behind enemy lines against the Nazis because the Apache Indians... were able to fight off for decades both the Spaniards and the Mexicans and the U.S. Cavalry for years because of their - they were great guerrilla fighters. They were great resistance fighters. And one of their ways of winning battles was psychological battles.
In moments Akiva was up in the ether, scarcely feeling the sting of ice crystals in the thin air. He let his glamour fall away, and his wings were like sheets of fire sweeping the black of the heavens. He moved at speed, onward toward another human city to find another doorway bitter with the devil's magic, and after that another, until all bore the black handprint....Once all the doors were marked, the end would begin. And it would begin with fire.
Every body continues in its state of rest or uniform motion in a straight line, except insofar as it doesn't.
The sport would not survive today if drivers were being killed at the rate they were in the 1960s and '70s. It would have been taken off the air. It is beamed into people's living rooms on Sunday afternoons, with children watching.
If... the motion of the earth were circular, it would be violent and contrary to nature, and could not be eternal, since ... nothing violent is eternal .... It follows, therefore, that the earth is not moved with a circular motion.
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