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Space Time Curvature and the TRampoline analogy

In the trampoline demonstration representing space-time and gravity, it is obviously the friction between the trampoline and the ball that determines the path of the ball. Friction is a physical interaction, so space-time has to physically interact with matter for this demonstration to be a plausible description of what is happening actually. My question is, what is or what causes that physical interaction or “friction” between space-time and matter when space-time is curved?? Thank you

Asked Jason Omahne

 

Answer:

The trampoline is just an analogy to understand the phenomenon. Gravity is like the depression of the trampoline causing a curvature in the space time continuum.

The curvature of spacetime around the source o...
The curvature of spacetime around the source of the gravitational force (Photo credit: Wikipedia)

(You may ask further related doubts as comments to this post.)

IF A TRAIN TRAVELS WITH SPEED OF LIGHT; WHAT HAPPENS TO ITS LENGTH??

IF A TRAIN  TRAVELS WITH SPEED OF LIGHT; WHAT HAPPENS TO ITS LENGTH?

Asked MARIAN

Answer

askphysicslogoAccording to the theory of relativity, the length will decrease to zero.

Please refer to ther following links for more information on the question.

  1. http://en.wikipedia.org/wiki/Length_contraction
  2. http://io9.com/5527521/what-happens-if-youre-traveling-at-the-speed-of-light-and-turn-on-your-headlights
  3. http://wiki.answers.com/Q/What_happens_when_you_travel_at_the_speed_of_light
  4. http://www.physics.org/interact/time-twins/special-relativity.html
  5. http://www.physlink.com/education/askexperts/ae169.cfm
Time dilation in transversal motion. The requi...
Time dilation in transversal motion. The requirement that the speed of light is constant in every inertial reference frame leads to the theory of relativity (Photo credit: Wikipedia)

Space Time

Prejith asked:

What is space time?

 

Ans:

In order to describe an event, we need to specify its position in space and the time of occurrence. A four-dimensional continuum with the three co ordinates of space and time as the fourth co ordinate is called space-time.

The members and visitors may add more related information via comments

image

Can you say What’s This?

Idea on origin of Gravity – A discussion

Derek shares his idea on origin of Gravity – “if you were to suddenly put a large object in space then the space would  be pushed out to the sides (displacement) . because the object  is now in the place were space once  occupied ?? so space is just pushing  back to its original area ???? is this what gravity is??? or bending of space?”

(Here are some related links suggested for exploring further –

  1. http://ag-physics.org/gravity/
  2. http://www.keshefoundation.com/overview.html
  3. http://www.regenerating-universe.org/13)_What_is_Gravity.htm
  4. http://theoryofeverything.co.uk/
  5. http://badphysics.wordpress.com/2010/01/11/%E2%80%9Con-the-origin-of-gravity-and-the-laws-of-newton%E2%80%9D-by-erik-verlinde/
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