The Scientific Papers of J. Willard Gibbs #248202

The condition that the point shall not penetrate the body gives another condition for the value of it. If the point remains upon the surface, A must have a certain value N, determined by the form of the surface and the velocity of the point. If the value of d' is less than this, the point must penetrate the body. Therefore, But this does not suffice to determine the acceleration of the point. Let us now apply formula (6) to the same problem. Since ii cannot be less than N, if s, 65620.