1. The problem statement, all variables and given/known data Young and Freedman: pg 700, Paragraph 1, line 2 Point particle never collide. I don't understand why that is so? 2. Relevant equations 3. The attempt at a solution Actually, I thought of one point particle being placed at the origin of a Cartesian coordinate system, and the other particle moving in the positive x-direction towards the first particle. If that's the case, then the two particles will eventually meet. If two particle meet, then by definition that's a collision. So point particles collide. But Young and Freedman have said that they don't. Surely, the authors can't be wrong! So, how do I solve the problem, then?