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!

Homework Help: Pendulum collision and elastic collision

  1. Jan 4, 2009 #1
    1. The problem statement, all variables and given/known data
    2 pendulums collide and stick together after being released from rest at angle Ø (each one is at Ø)
    pendulum 1 mass is 2m, pendulum 2 mass is m
    What is the final swing angle of the stuck together masses? in what direction is the swing?

    repeat for elastic collision

    2. Relevant equations
    Ui+Ki+Win-Wout=Kf+Uf (conservation of energy)
    conservation of momentum

    3. The attempt at a solution
    a very sad one

    sorry i couldnt put a picture up, even though it would help a great deal
    but any suggestions would help
    and if you couldnt tell it has to be solved symbollically
    Last edited: Jan 4, 2009
  2. jcsd
  3. Jan 4, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper

    They will collide at angle phi=0 (the lowest point on the pendulum), right? What is the velocity (and hence momentum) of each pendulum just before they collide? If they stick together, then after the collision you have a single object with the same momentum. What's it's velocity? Translate that into to how high it will go, and what the angle is. Try and start answering some of these questions. It will make for a much improved 'attempt at a solution'.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook