The conditions why objects rolling down different inclined tracks cover different distances in equal interval of time are studied. We want to demonstrate that the time taken by a ball to cover a chord of a circumference because of gravity, does not depend on the length of the chord itself. […]
In this paper the author describes Enriques’ ideas on the concept of space and on the relations between geometry and physics. Enriques criticized the views of Kant and Poincare, considered geometry as an empirical science and anticipated some aspects of recent Popper’s epistemology. […]