1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Min weight of elevator accelerating, constant velocity, decelerating

  1. Jun 19, 2013 #1
    1. The problem statement, all variables and given/known data

    Starting from rest, an elevator accelerates uniformly between the 1st and 2nd floors, and decelerates uniformly between the 5th and 6th floors, coming to a stop at the 6th floor. Between the 2nd and 5th floors, the elevator covers the 6 meter distance between each two adjacent floors in 1 second. Inside, Liz (who is about to graduate) is standing on a scale that reads 800 N when the elevator isn't moving. What was her minimum scale reading during the trip? Use g = 10 m/s^2.

    2. Relevant equations

    3. The attempt at a solution

    From 1st floor to second floor the equation would be [tex] N + Ma = Mg. [/tex]
    From second floor to fifth, it moves with constant velocity i.e 6 m/s
    From fifth to sixth, the equation would be [tex] N - Ma= Mg. [/tex]

    Here, from the given data in question M = 8kgs.
    How do I find the minimum reading?
  2. jcsd
  3. Jun 19, 2013 #2
    Never mind. Was making a silly mistake. Got it.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Discussions: Min weight of elevator accelerating, constant velocity, decelerating