I’m constantly jealous of my first year physics lab students, because they always get to play with the best toys for their experiments. For example, this afternoon they were testing motion on a frictionless inclined plane using an air track (elevated onto a block of wood), a sonar device and a giant styrofoam ball. Last week, they got to study projectile motion by firing ballbearings out of spring guns in front of a webcam. Later on, during the semester, they will be studying conservation of linear momentum by literally ramming pucks into each other on an air-hockey table!
These are, of course, so much better than the toys that they get to play with in second year physics; the kind that can give you cancer if you use them improperly (which, to extend the ‘toy’ metaphor, might be called the ‘worst play-doh ever’).
However, they’re sloppy with their toys. For example, today, most of them forgot to pull heir wooden blocks out from under their tracks after they were done, inconveniencing me.
So the moral of the story is:
Always put your toys away when you’re done playing with them.