I'm still struggling with spacetime curvature. I want to know about the spacetime intervals in the following scenario: An apple is cut loose from a tree, but is still attached by an unstretchable rope that is measured to be 10 meters by the tree observer. (I'm ignoring all but relativistic effects. I'm also assuming that initial gravitational acceleration from the given location is exactly 10 m/s. I'm not interested in detailed calculations, just the relevant (in)equalities.) Event1: apple cut loose from tree at t=0 Event2: clock at original apple position ticks 1 second Event3: rope yanks on tree after apple falls rope length Event4: rope yanks on apple Spacetime intervals, according to tree frame: E1-2: distance=0, (proper) time=1s E1-3: distance=0, time=1? E1-4: distance=10m, time=1? E3-4: distance=10m, time=0? or E4 sooner by S.R.? E2-3: distance=0, time=? according to apple frame: E1-2: distance>10m, time<1s (so velocity of clock>10m/s ?) (S.R. effect also slows tree clock) E1-3: distance>10m, time=? E1-4: distance=0, proper time=? E3-4: distance>10m, time=0? or E3 sooner by S.R.? E2-3: distance>10m?, time=?