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<blockquote data-quote="Ayasano" data-source="post: 79344" data-attributes="member: 4804"><p>Whoever tried to explain that to you obviously didn't explain it very well. The concept of a centrifugal (center-fleeing) force comes from classical physics, and in modern physics has been superseded by centripetal (center-seeking) force. Both, however, are more like <em>classes</em> of forces than forces in and of themselves.</p><p></p><p>With regards to an object in orbit around the Earth, the centripetal force in question is gravity. Gravity does not need to be negated at all for an object to orbit. (Weightlessness =/= negation of gravity) Indeed, if gravity was negated, no forces would be acting on the object, so it would continue moving in a straight line at a constant velocity in whatever direction it happened to be moving. Instead, gravity accelerates the object towards the Earth. An orbit occurs when the object is moving fast enough perpendicular to the Earth that this acceleration results in a curved path around the Earth. There is no centrifugal, or outwards, force. If there was, it would cancel out gravity, the sum of all forces would be equal to zero and the object would again travel in a straight line away from the Earth.</p><p></p><p>Another way of visualizing orbits according to General Relativity is that gravity is the result of the Earth's mass warping spacetime, like a bowling ball laying on top of a sheet of fabric would stretch it downwards. If you roll a marble along the edge of this depression at just the right speed, it will roll in a circle around the ball, at least until friction slows it down. (Which, incidentally, explains why light, despite having no mass, is affected by gravity)</p><p></p><p><img src="https://c479107.ssl.cf2.rackcdn.com/files/10823/width668/n8yptygz-1337325701.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><a href="http://en.wikipedia.org/wiki/Introduction_to_general_relativity" target="_blank">Here's</a> a very useful introductory article on General Relativity.</p></blockquote><p></p>
[QUOTE="Ayasano, post: 79344, member: 4804"] Whoever tried to explain that to you obviously didn't explain it very well. The concept of a centrifugal (center-fleeing) force comes from classical physics, and in modern physics has been superseded by centripetal (center-seeking) force. Both, however, are more like [I]classes[/I] of forces than forces in and of themselves. With regards to an object in orbit around the Earth, the centripetal force in question is gravity. Gravity does not need to be negated at all for an object to orbit. (Weightlessness =/= negation of gravity) Indeed, if gravity was negated, no forces would be acting on the object, so it would continue moving in a straight line at a constant velocity in whatever direction it happened to be moving. Instead, gravity accelerates the object towards the Earth. An orbit occurs when the object is moving fast enough perpendicular to the Earth that this acceleration results in a curved path around the Earth. There is no centrifugal, or outwards, force. If there was, it would cancel out gravity, the sum of all forces would be equal to zero and the object would again travel in a straight line away from the Earth. Another way of visualizing orbits according to General Relativity is that gravity is the result of the Earth's mass warping spacetime, like a bowling ball laying on top of a sheet of fabric would stretch it downwards. If you roll a marble along the edge of this depression at just the right speed, it will roll in a circle around the ball, at least until friction slows it down. (Which, incidentally, explains why light, despite having no mass, is affected by gravity) [IMG]https://c479107.ssl.cf2.rackcdn.com/files/10823/width668/n8yptygz-1337325701.jpg[/IMG] [URL='http://en.wikipedia.org/wiki/Introduction_to_general_relativity']Here's[/URL] a very useful introductory article on General Relativity. [/QUOTE]
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