Relativity has fascinated many young minds (old too).
Below is a conversation between a student and a Physics Teacher on Facebook chat.
did u watch interstellar movie??
kk… i hv a doubt regarding g concept??
c according to relativity-a person hu went to space wud xperience time dilation compared to us on earth…. then it’s also possible tht. gravity here on earth is more than away from earth,i.e.gravity curves spacetime,thus dilatin time here on earth compared to a spacecraft man…..these two concets are contradictory???
kk….bt wht causes time to go slower near a black hole???
gravity is incorporated into sp theory of rel…
and this causes curving of space time???
Gravity causes curvature in the space time continuum
this explains why two masses attract each other
ya bt still i dnt get ???
c a person spending time near the event horizon,time slows down compared to a person in a space craft moving at a considerable speed???this can similarly apply to earths frame instead of event horizon???
kk…i shall surely read that.,bt i hv a plus2 physics doubt too??
the speed of an em wave is the sp of light..,bt em wave composed of electric and magnetic fields is related to charges.,hw cum these charges move at sp of light???doubt frm ncert txt on velocity selector