Recent content by lrkr82

So you say the box moves at point A, when the spring is still completely compressed? I say there's no movement yet, no work against friction. So what do we have at point A? Remember the box is pushed by the spring some before sliding alone. How long is this sliding path and where does it start...

I venture a guess that P is just where both objects contact; thus: PO=R That's what I know about round things rolling on flat things :)