Hey, i need some insight for free body diagrams. Say your in an elevator and your nomral wieght is 500N and there also is a scale. The scale starts to read 450N. Which means it would be accelrating downwards. So for the FBD, 500N would be in the middle. Then would there be an arrow pointing down being Fg as 450N?? I guess you would assume no air resistence, so would there be any value for Fn?? Also if the scale reads 0, would Fn=Fg?? thanx again.