Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Fnet and Force.

  1. May 29, 2008 #1
    1. The problem statement, all variables and given/known data

    An elevator with a mass of 650 Kg supported by steel cable. What is the tension in the calbe when the elevator is accelerated upward at the rate of 3.00 m/s^2

    2. Relevant equations

    well he gives the equations that we can use as: Fnet=ma, w=mg and g=9.8m/s^2
    I dont know what W means. Also he never taught us how to find tension.

    3. The attempt at a solution

    Well I used Fnet: 650KG * 3.00m/s^2= ANS.

    If this is right can someone explain to me how.


    Please Help.
    Last edited: May 29, 2008
  2. jcsd
  3. May 29, 2008 #2


    User Avatar
    Homework Helper

    well the resultant acceleration is 3 ms[itex]^{-2}[/itex]
    so the net force,[itex]F_{net}=650*3=1950N[/itex]

    The weight of the elevator is W.
    The tension in the cables holding the elevator is T.

    If the weight is acting down and tension is acting up, and the resultant of these 2 is in an upward direction. What would be an equation relating the the resultant (net) force, the tension and weight?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook