Diagram A: Atwood Machine

Frictionless Pulley $m_{2}$ $m_{1}$ T $m_{2}$g T $m_{1}$g ↑ a ↓ a a = ($m_{1}$−$m_{2}$)$\frac{g}{m_{1}+m_{2}}$ ; $m_{1}$ > $m_{2}$

Diagram B: Person in Lift — Apparent Weight

N (W') mg a↑ Lift accelerating UP: W' = m(g+a)