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: Two objects collide and bounce off each other. Linear momentum

  1. Oct 21, 2008 #1
    Two objects collide and bounce off each other. Linear momentum

    A. is conserved only if the enviroment is frictionless
    B. definetly not conserved
    C. definetly is conserved
    D. is conserved only if the collusion is elastic

    A perfectly elastic collision is defined as one in which there is no loss of kinetic energy in the collision. An inelastic collision is one in which part of the kinetic energy is changed to some other form of energy in the collision. Any macroscopic collision between objects will convert some of the kinetic energy into internal energy and other forms of energy, so no large scale impacts are perfectly elastic. Momentum is conserved in inelastic collisions, but one cannot track the kinetic energy through the collision since some of it is converted to other forms of energy. Collisions in ideal gases approach perfectly elastic collisions, as do scattering interactions of sub-atomic particles which are deflected by the electromagnetic force. Some large-scale interactions like the slingshot type gravitational interactions between satellites and planets are perfectly elastic.

  2. jcsd
  3. Oct 21, 2008 #2


    User Avatar
    Homework Helper

    Maybe read your material a little more closely?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook