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

Rope tension no friction question

  1. Dec 9, 2009 #1
    1. The problem statement, all variables and given/known data
    How much tension must a rope withstand if it is used to accelerate a 1050kg car horizontally at 1.20 m/s2? IGNORE FRICTION!

    3. The attempt at a solution
    What i did was
    T=1.15x10 to the power of 4
    But thats not the answer the answer is 1.26x to the power of 3kg
    What did i do wrong?
  2. jcsd
  3. Dec 9, 2009 #2


    User Avatar
    Homework Helper

    Why are you including gravity? It's not as if you're lifting the car up.

    Try drawing a free-body diagram and writing out Newton's second law TWICE, once for the y direction and once for the x direction.
  4. Dec 9, 2009 #3
    Sorry i made a dumb mistake!
    its been a long day and i was for some reason including gravity in alot of things that i shouldn't
    i got the question now.
    thanks for replying anyways:)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook