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

Quick dynamics lab question

  1. Nov 16, 2003 #1
    Hey here's a quick easy quetion, just to make sure doing a lab and please answer right away if possible. A dynamics cart moving with speed v is made to collide "head-on" with a second dynamics cart of equal mass, which is initially at rest. Well I predicted that both have equal masses they will experience the same roughly veolicity, is that correct?

    But what if they collide on with same speed?
  2. jcsd
  3. Nov 17, 2003 #2


    User Avatar
    Science Advisor

    Both carts have the same speed and same mass. The situation is completely symmetric. What do YOU think will happen?
  4. Nov 17, 2003 #3
    No, they don't. At least, not at the same time...(grin)
    Initially, one car is at rest, the other is not.

    Hint: ever played snooker?
  5. Nov 17, 2003 #4

    Doc Al

    User Avatar

    Staff: Mentor

    I believe HallsofIvy was discussing the second question.
  6. Nov 18, 2003 #5


    User Avatar
    Science Advisor

    Yep, that was what I intended to answer but I didn't make that clear.

    game, if you are still working on this- you really need more information. If you are assuming perfectly elastic collisions, then use conservation of momentum and conservation of energy to get two equations for the two final speeds.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook