First slide

Different types of Forces

Question

A man of mass 60 kg is riding in a lift. The weight of the man when the lift is accelerating upwards and
downwards at 2 $m s^{- 2}$ are respectively (Take, g = 10 $m s^{- 2}$ ) [AMU 2011]

Easy

A

720 N and 480 N
B

480 N and 720 N
C

600 N and 600 N
D

None of these

Solution

When the lift is accelerating upwards with a constant acceleration a, then the apparent weight,
$w = m (g + a) = 60 (10 + 2)$
$= 60 \times 12 = 720 N$
When the lift is accelerating downwards with acceleration a, then apparent weight,
$w^{'} = m (g - a) = 60 (10 - 2)$
$= 60 \times 8 = 480 N$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App