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Natural Science Forum / Physics / Relativity / September 2006Aren't they downside up?
Why are "spacetime" diagrams drawn downside up? If we're falling through the void, shouldn't our paths point downwards. It's much easier then to visualize our galaxy going down the plug hole. By the way, why don't the stars go around the galaxy at the right speed? Barry > Why are "spacetime" diagrams drawn downside up? and upside down > If we're falling through the void, shouldn't our paths point downwards. which way is downwards? > It's much easier then to visualize our galaxy going down the plug hole. wher's the plughole? > By the way, why don't the stars go around the galaxy at the right speed? and why does the sea not going further than the beach > Barry > "Barry" schreef >>Why are "spacetime" diagrams drawn downside up? >>If we're falling through the void, shouldn't our paths point downwards. > which way is downwards? If the top of the diagram is the top, then downwards should be towards the bottom. For some reason, they always show the bottom at the top. >>It's much easier then to visualize our galaxy going down the plug hole. > wher's the plughole? Right in front of us, towards the bottom. >>By the way, why don't the stars go around the galaxy at the right speed? > and why does the sea not going further than the beach I think that the sea is about to go further than the beach, if the global warming pundits are correct. By the way, why *don't* the stars go around the galaxy at the right speed? Could it be for the same reason that water doesn't go straight down the plug hole? Barry > Why are "spacetime" diagrams drawn downside up? > > If we're falling through the void, shouldn't our paths point downwards. > > It's much easier then to visualize our galaxy going down the plug hole. It's much easier to replace the y in an (x,y) diagram by t and then you're just doing high school analytic geometry: http://groups.google.com/group/sci.physics.relativity/msg/b1e5988e010dd4f6 You can do special relativity without even thinking. Haven't you noticed how easy it is? Dirk Vdm > By the way, why don't the stars go around the galaxy at the right speed? > > Barry > Why are "spacetime" diagrams drawn downside up? > > If we're falling through the void, shouldn't our paths point downwards. Because then we'd have to use the left-hand rule. > It's much easier then to visualize our galaxy going down the plug hole. > > By the way, why don't the stars go around the galaxy at the right speed? > > Barry > Why are "spacetime" diagrams drawn downside up? > > If we're falling through the void, shouldn't our paths point downwards. We're not falling downward though the void and "spacetime" diagrams were probably designed by a mathematician. In physics it's standard to put the time axis horizontal, as in oscilloscopes: the function f(t) is plotted vertical. But why the tradition is to take upwards on the page or screen as positive I also don't know... Harald > It's much easier then to visualize our galaxy going down the plug hole. > > By the way, why don't the stars go around the galaxy at the right speed? > > Barry | > Why are "spacetime" diagrams drawn downside up? | > | > If we're falling through the void, shouldn't our paths point downwards. | | We're not falling downward though the void and "spacetime" diagrams were | probably designed by a mathematician. NONSENSE! No self-respecting mathematician would turn Descartes' coordinates sideways, you f.cking stupid probable troll. Spacetime diagrams are the work of fuckwits like you. Androcles > | > Why are "spacetime" diagrams drawn downside up? > | > [quoted text clipped - 9 lines] > Spacetime diagrams are the work of fuckwits like you. > Androcles To the contrary! Physicists usually draw x=f(t) as follows: !x ! ! ! !------------ t | > | > Why are "spacetime" diagrams drawn downside up? | > | > [quoted text clipped - 17 lines] | ! | !------------ t No no, that is for mathematicians and engineers. To the uncontrary, spacetime diagrams are the work of fuckwits like you. |
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