1. Not finding help here? Sign up for a free 30min 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!

Torque on a block with acceleration 4i-3j.

  1. Apr 7, 2007 #1
    1. The problem statement, all variables and given/known data
    A 2.0-kg block starts from rest on the positive x axis 3.0 m from the origina and thereafter has an acceleration given by a = 4i-3j. The torque, relative to the origin acting on it at the end of 2.0 s is:

    2. Relevant equations

    linear acceleration= (radius)(angular acceleration)

    torque= (moment of Inertia)(angular acceleration)

    3. The attempt at a solution

    I found the angular acceleration using the formula above
    moment of Inertia=(mass)(radius square)
    Then find the torque using the formula above

    that's not it....help!...:frown:
  2. jcsd
  3. Apr 7, 2007 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    HINT: Definition of torque;

    [tex]\tau = \vec{F}\times \vec{r} = m\vec{a}\times\vec{r}[/tex]
  4. Apr 7, 2007 #3

    Doc Al

    User Avatar

    Staff: Mentor

    Hint: Where is the block at the end of 2 seconds?
  5. Apr 7, 2007 #4
    thanks for the help guys...
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Torque on a block with acceleration 4i-3j.
  1. Accelerating blocks (Replies: 1)