Explanation

(c) When a person of mass $m$ is placed on a weighing machine which is placed in a lift, then actual weight of the person is $mg$. This acts on a weighing machine which offers a reaction R given by the reading of weighing machine. This reaction exerted by the surface of contact on the person is the apparent weight of the person. When lift is accelerating upwards at the rate of $a$, then reaction
$R - mg = ma$
$\therefore\ \ R = m(g + a)$
Hence, apparent weight is greater than actual weight.
[image:5_image219.jpeg]