I don't understand how General Relativity describes an apple falling from a tree. I have read things that made it more confusing (e.g. the earth actually moves towards the apple which made no sense to me) and I can't think of the Apple falling in non-Newtonian terms. If there is not a downward force pulling it towards the earth then why does it fall that way as it follows the curve of spacetime caused by the earth's mass? I guess part of the problem is that I don't really understand spacetime curving beyond the popular image of it as a fabric being indented by a planet which then causes other objects to follow the curve it caused, I.e. gravity. That only makes conceptual sense to me, I have no real understanding beyond that.
I'd appreciate any help to try and make it click in my mind. Here are some things I learnt that helped me understand a little:
-From the apple's perspective it is travelling in a straight line. Similarly, the earth 'believes' it is travelling in a straight line but we observe it orbiting the sun due to spacetime bending.
-When the Apple is on the branch it is travelling in time but not space. When it falls it travels in both.
I don't understand why an apple falls from a tree
|Last day to win £100 of Amazon vouchers - don't miss out! Take our quick survey to enter||24-10-2016|