# The Naked Scientists Forum

### Author Topic: The theory that time can be slowed down or sped up  (Read 11311 times)

#### Atomic-S

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##### Re: The theory that time can be slowed down or sped up
« Reply #25 on: 31/05/2006 05:37:16 »
quote:
- so the gravitational attraction at the equator is less than at the poles (the equator is further from the earth's centre of gravity, and gravitational strength varies inversely with distance-squared)

- gravitational force slows time down (according to GR), so relative time actually passes more quickly where the relative gravitational attraction is less (i.e. on the equator)

Be careful you do not confuse gravitational attraction and gravitational potential. Gravitational attraction is the force (per unit mass) experienced by a small mass located at that point; graviational potential, however, is how much energy (per unit mass) is required to move the object from some previously defined reference point to that point. Thus, gravitational attraction is the gradient (differential) of potential.

The question therefore rises: Is the clock rate affected by the intensity of gravitational attraction, or the value of gravitational potential? I believe it is the latter, because and understanding of how gravity attracts, when examined at the quantum level, leads to the conclusion that it attracts because of a gradient in time. The gradient in the clock rate thus equates to a gradient in potential, meaning that the clock rate equates to potential. What that means is that any 2 points at the same altitude have the same clock rate, even if they do not have the same gravitational intensity. Assuming that the earth's surface is an equipotential surface (very nearly true of the oceans), the clock rate everywhere thereon must be the same -- not considering, of course, the effects of motion. Taking that into account complicates the picture in ways I do not understand.
« Last Edit: 31/05/2006 05:38:55 by Atomic-S »

#### JimBob

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##### Re: The theory that time can be slowed down or sped up
« Reply #26 on: 31/05/2006 21:25:32 »
quote:
Originally posted by ukmicky

quote:
The best book I've seen on relativity is "Relativity - the Special and General Theory" by Albert Einstein. Yes, THE Albert Einstein. He was a very gifted communicator as well as physicist.

Is there an online resource where you can read this book and others.

Michael                 HAPPY NEW YEAR

Certinly. http://www.gutenberg.org/etext/5001

[:p]

The mind is like a parachute. It works best when open.  -- A. Einstein

#### ukmicky

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##### Re: The theory that time can be slowed down or sped up
« Reply #27 on: 31/05/2006 22:20:45 »
Cheers jimbob ,where were you 4 months ago.

Michael
« Last Edit: 17/09/2007 23:03:41 by ukmicky »

#### DocN

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##### Re: The theory that time can be slowed down or sped up
« Reply #28 on: 04/06/2006 17:32:28 »
What part does Hawking's description of the origin of time as having "space-like" dimensions?
Doc

#### qazibasit

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##### Re: The theory that time can be slowed down or sped up
« Reply #29 on: 08/06/2006 11:07:05 »
well time is not man made as ur saying. If you think that time is what takes b/w the motion or activity then this means that if ur standing still or sitting still then there is no time. we are bound in the time and space.

#### The Naked Scientists Forum

##### Re: The theory that time can be slowed down or sped up
« Reply #29 on: 08/06/2006 11:07:05 »