First slide

Pseudo force

Question

A person of mass 60 kg stands on a weighing machine in a lift which is moving a) upwards with a uniform retardation of 2.8 ms^–2 b) downwards with a uniform retardation of 2.2 ms^–2. Find the reading shown by the weighing machine in each case.

Moderate

Solution

$\large W'=m(g-a)=60(9.8-2.8)=420N$
$\large W''=60(9.8+2.2)=720N$

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