A sand pendulum that creates a beautiful pattern only by its movement.
But why does the ellipse change shape?
The pattern gets smaller because energy is not conserved (and in fact decreases) in the system. The mass in the pendulum gets smaller and the center of mass lowers as a function of time. Easy as that, an amazing pattern arises through the laws of physics.
this is from a real diary by a 13-year-old girl in 1870. teenage girls are awesome and they’ve always been that way.
TODAY IN HISTORY: The rings of Saturn, August 17, 1981, in an enhanced view from the Voyager 2 space probe, assembled from clear, orange and ultraviolet frames taken at a distance of 8.9 million km (5.5 million miles).
(NASA)
im putting together a couple of scottish folk mixes bc that’s what i do and im honestly curious if anyone in my country has ever been unequivocally happy about anything ever
I’m serious
Dallas Stars @ Vancouver Canucks || 16 March 2017
Tyler Seguin nearly loses his head during warm-up.