question.....

NewtonUpdate(time);

...Am I correct to assume that you'd want to pass the amount of time that has passed to Newton? So it knows how to correctly update movement?

Assuming I am correct, then would time_step/frame be incorrec? time_step/frame are multipliers for scaling movement in ticks (1/16th second).

So when you use:
newtonUpdate(time_frame/16);
You wouldn't be updating correctly...

It would in fact be:
newtonUpdate(16/time_frame);


I fixed this in the A6 version and physics seem more realistic, but maybe it's just me and I'm completely wrong