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    I came across a question on a past paper involving lifts and contact forces:
    http://www.ocr.org.uk/images/79221-q...-mechanics.pdf
    Question 5d).
    I've tried looking at the mark scheme and examiner report to understand the answer but I can't figure it out. I don't really understand what the mark scheme is saying so I'd appreciate somebody explaining how to properly answer this question and explain the physics behind it. Thanks in advance.
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    Hey! This video on the topic from Khan Academy is really helpful in explaining.

    http://www.youtube.com/watch?v=hoRsHNSrMpc
 
 
 
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