51 posts
How long it takes a ball to drop on various Solar System bodies

James O’Donoghue made this straightforward animation that shows how long it takes for a ball to drop one kilometer on different planets: It might be surprising to see large planets have a pull comparable to smaller ones at the surface, for example Uranus pulls the ball down slower than at Earth! Why? Because the low average density of Uranus puts the surface far away from the majority of the mass....

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Gravity visualized in physics demo

Dan Burns explains some properties of time and space using marbles and two large pieces of spandex sewn together in a classroom demonstration. x Physics and me never got along in high school and college, but I did always enjoy the low-budget demonstrations. It's one thing to see calculations on paper. It's another when the professor sets up a stuffed monkey on one side of the room and then...

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