Why would your "weight" change 3 times in an elevator trip?

Imagine a person weighs 600 N

Start - Scale reading goes up
(greater than 600 N) Inertia
 (Object rest tends to stay at rest)

Most of trip up:

(W = 600 N) Constant velocity
Net force = 0

Slow Down and Stop
- (Scale reading less than 600 N)
Object in motion tends to stay in motion

2nd Law - Relationship between F, m, a

Inertia - Dr. Dave Hall of Fame

Unbalanced forces cause objects to accelerate:

 F_net = Resultant

1.  Acceleration is directly proportional to force exerted on an object

Mass & Acceleration