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!

Elastic vs. Completely Elastic?

  1. Nov 30, 2013 #1
    1. The problem statement, all variables and given/known data

    A 2.4kg ball falling vertically hits the floor with a speed of 2.5m/s and rebounds with a speed of 1.5m/s. The impact or "collision" described in this problem is:

    a. completely elastic
    b. completely inelastic
    c. elastic
    d. inelastic

    2. The attempt at a solution

    As I understand it, the collision in this problem is "inelastic". However, the answer choices make a distinction between "completely elastic" and "elastic" collisions. Since there are no elastic collisions on the macroscopic scale, this cannot be a "completely elastic" collision. Yet, since some macroscopic collisions are approximated as elastic collisions, this might count as an "elastic" collision.

    Is the distinction between elastic and completely elastic collisions a legitimate one, or is it there just to throw me off? How would you answer this question?

    Thanks!
     
  2. jcsd
  3. Nov 30, 2013 #2

    vela

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Education Advisor

    I think it's there just to throw you off. A collision is either elastic or not. On the other hand, an inelastic collision isn't necessarily completely inelastic, so it makes sense to make a distinction.
     
  4. Nov 30, 2013 #3
    Thank you!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Elastic vs. Completely Elastic?
  1. Elastic vs inelastic (Replies: 17)

Loading...