Relativity

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 Tweefo (January 07, 2014, 16:08:17 PM):
If only there was a site that you could go to and look up stuff ;)

http://en.wikipedia.org/wiki/Theory_of_relativity#Two-theory_view

Thanks. Problem is, like I said, how to say it in a few sentences and at primary school level. My target market is the old model c primary schools. I work at high schools as well, but it is quite difficult to get an appointment there.
 Brian (January 07, 2014, 16:46:59 PM):
just create enquiring minds and they will start looking for the answers to riddles etc. I would tell them how long light takes to travel from the nearest star (not the sun) and the speed at which it travels....then i'd boggle their minds about looking back in the past! some will run to mommy and tell them they saw the past!! then get a klap for believing shit!
 cr1t (January 08, 2014, 09:24:06 AM):
If only there was a site that you could go to and look up stuff ;)

http://en.wikipedia.org/wiki/Theory_of_relativity#Two-theory_view

Thanks. Problem is, like I said, how to say it in a few sentences and at primary school level. My target market is the old model c primary schools. I work at high schools as well, but it is quite difficult to get an appointment there.

Well Let me have a crack at it. (So we talking about a paragraph here?)

Between 1905 and 1915 Albert Einstein developed the theory of General relativity. In General relativity Space and time can be thought as one thing and that Mass acts upon it.
Think of a bed sheet being stretched out as space-time and a bowling ball lying upon it, bending the space-time around it. Why is it theory useful? It gives us a clue to how mass and gravity work in space times, and helped us learn that there are things like black holes.

The second theory of Albert Einstein is special relativity, and they key to it is understanding that no matter how fast you are moving you will always measure the speed of light at the same speed, and for this to be possible it means that the faster you are moving the slower your measurement of time is going to be. It may sound strange but with out General Relativity and special relativity things like GPS won't work that is because the satellites that give us GPS work on clocks. And the clocks on the satellites run at different speeds that the ones here on earth and we have to keep adjusting the clocks on these satellites so that GPS works properly.
 brianvds (January 08, 2014, 10:11:13 AM):
Think of a bed sheet being stretched out as space-time and a bowling ball lying upon it, bending the space-time around it. Why is it theory useful? It gives us a clue to how mass and gravity work in space times, and helped us learn that there are things like black holes.

It may be useful and entertaining to set up[ this sheet thing for real, perhaps on a collapsible frame that is easy to transport, and then show them how a weight will make a dent in it, and how a marble rolled across the sheet will be affected.
 Rigil Kent (January 11, 2014, 21:12:25 PM):
Here is an interesting application of relativity. The short video on the page below explains gravitational lensing, and how it helps astronomers to see ancient galaxies that would otherwise be beyond visual reach.

http://oneminuteastronomer.com/9405/hubble-frontier-field/