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!

Linear and angular momentum problem

  1. Dec 30, 2012 #1
    This is not a homework problem.
    I am trying to set up the following problem. I am doing something wrong. Help. I have attached the problem and figure but here is the text.

    Figure 10-52 shows a thin, uniform bar of Length L and mass M and a small blob of putty of mass m. The system is supported by a frictionless horizontal surface. The putty moves to the right with a velocity v, strikes the bar at a distance d from the center of the bar, and sticks to the bar at the point of contact. Obtain expression for the velocity of the system's center of mass and for the angular speed following the collision.

    To find the angular speed, I use the conservation of angular momentum.

    mv(1)d = m*v(2)*d + (1/12)ML^2 * V(2)

    Is this a correct setup?

    Thanks
    Barry
     

    Attached Files:

  2. jcsd
  3. Dec 30, 2012 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Compute the angular momentum about the center of mass of the system.
     
  4. Dec 30, 2012 #3
    Thanks Doc Al, I think I see your point. When the putty hits the bar, the rotation is about the center of mass of the rod/putty combination and will be between the center of the rod and the putty as I how on my attachment. Yes?
     

    Attached Files:

  5. Dec 30, 2012 #4

    Doc Al

    User Avatar

    Staff: Mentor

    Yes, that's correct. Now figure out the speed of the bullet and the bar in the center of mass frame.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Linear and angular momentum problem
Loading...