Apparent Weight
The effective weight of a body, equal to the normal contact force supporting it in an accelerating frame.
Governing formula
W_app = m (g + a)
SI unit
N
In depth
Accelerating upward increases normal force and apparent weight; accelerating downward decreases apparent weight. Free fall causes weightlessness (W_app = 0).
Examples in the real world
Feeling heavier when an elevator accelerates upward, or weightlessness during orbital free fall.