It took just a moment for that head to fall, but a hundred years might not produce another like it. -- Joseph-Louis Lagrange, referring to the execution of Lavoisier on May 8, 1794
- 1.3: 1.3 Galilean Relativity
- Galilean relativity states that the same laws of physics apply in any frame of reference that is moving in a straight line at constant speed. We need to refine this statement, however, since it is not necessarily obvious which frames of reference are going in a straight line at constant speed.