Hi all, How does one calculate the point where impact of a moving object actually begins to move a stationary one, rather than just make noise? Let's keep it simple and assume the objects are of the same material, the stationary one is not anchored, and they won't shatter or explode. Something like whacking a croquet ball with a mallet (lol, the things that keep me awake at night... ) If the answer is too time consuming, perhaps someone has a link? Thanks, moo __________________ moo (moo') adj. Of no practical importance; irrelevant, such as a moo point (i.e. a cow's opinion).