World Science Scholars
4.5 Non-Relativistic Simultaneity

Check out this interactive demonstration, which shows how we would expect light to behave based on non-relativistic experience. Use the slider to pick the train’s speed, and then click start. The flash heading forward would travel faster, getting a “kick” from the train’s motion, while the flash heading backward would travel slower, being “dragged” by the train’s motion. Were this the case—it’s not—notice that the light would reach the front and back ends of the train at the same moment from all perspectives, regardless of the train’s speed.



Share with others

Select this checkbox if you want to share this with all users

Select Users

Enter the usernames or email IDs of the users you want to share with

Please enter message

Explain why you want them to see this

Send this to a friend