Turn on thread page Beta
    • Thread Starter

    Q)A person is standing in a lift on a bathroom scale moving upwards with an acceleration of 2ms^-2.The mass of the person is *x* kg.The lift suddenly decelarates upwards with 6ms^-2 and comes to rest after travelling another 10 metres.The reading on the scale before the decelaration was twice the reading just after the decelaration.Find the value of *x* if the difference between the two scale readings was 55kg.THANKS

    What you need to do for this question is start by drawing two free body force diagrams for the person for each stage in the lift. Remember that if you are told the acceleration of the lift, this will be the same as the acceleration of the person. Also, the normal contact force on the person will be the same as the reading on the scales multiplied by g. You can in fact immediately find the two scales readings using the fact that one is double the other, and that their difference is 55kg.
Submit reply
Turn on thread page Beta
Updated: January 25, 2010
The home of Results and Clearing


people online now


students helped last year

University open days

  1. Sheffield Hallam University
    City Campus Undergraduate
    Tue, 21 Aug '18
  2. Bournemouth University
    Clearing Open Day Undergraduate
    Wed, 22 Aug '18
  3. University of Buckingham
    Postgraduate Open Evening Postgraduate
    Thu, 23 Aug '18
A-level students - how do you feel about your results?
Useful resources

Make your revision easier


Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here


How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.