Question

Tabulate the apparent weight of person moving in a lift when lift is 

(i) moving upwards 

(ii) moving downwards 

(iii) at rest 

(iv) falling down freely

Answer 1

Case 1 : Lift is moving upward with an acceleration 'a'	Case 2 : Lift is moving downward with an acceleration 'a'	Case 3 : Lift is at rest	Case 4 :Lift is falling down freely
R - w = Fnet = ma R = w + ma R = mg +ma R = m (g + a)	W -R = Fnet = ma R = W - ma R = mg - ma R = m (g - a)	Here, the acceleration is zero a = 0 R = W R = mg	Here, the acceleration is equal to g a = g R = m(g - g)
R >W	R <W	R = W	R = 0
Apparent weight is greater then the actual weight.	Apparent weight is lesser than the actual weight.	Apparent weight is equal to the actual weight.	Apparent weight is equal to zero.