Football Unfiltered

Real football. Real moments. No filter.

[nebulica @nebulica]

A prism bends a ray twice once going in, once coming out. The total turn is the angle of deviation δ.

δ = (i + e) − A

Different colors have different refractive indices, so they deviate by different amounts. That is the spectrum.

[nebulica @nebulica]

The work–energy theorem: net work on a particle equals the change in its kinetic energy.

W = ΔK = ½mv₂² − ½mv₁²

Work is the area under the F–x curve. That area is exactly how much the motion speeds up or slows down.

[nebulica @nebulica]

Can you reverse the spin of this tetromino?

[nebulica @nebulica]

Can you reverse the spin of this sphere?

[matharium @matharium]

Can you reverse the spin of this knot?

[nebulica @nebulica]

Can you reverse its spin?

[nebulica @nebulica]

Can you reverse the spin of this trefoil knot?

[Football Unfiltered @unfilteredcf]

Wow amazing i did it

[nebulica @nebulica]

Can you reverse the spin of this annulus?

[nebulica @nebulica]

Can you reverse the spin of this annulus?

[Football Unfiltered @unfilteredcf]

If you can do this??

[nebulica @nebulica]

Can you reverse the spin of this globe?

[matharium @matharium]

Can you reverse the spin of these gears?

[nebulica @nebulica]

Can you reverse the spin of this coil?

[nebulica @nebulica]

Can you reverse the spin of this cylinder?

[nebulica @nebulica]

Can you reverse the spin of this donut?

[matharium @matharium]

Take any 4 digit number with at least two distinct digits. Sort digits descending, sort ascending, subtract. Repeat.

You will reach 6174, always, and stay there: 7641 minus 1467 is 6174 again. We brute force checked all 8,991 eligible numbers. Every one arrives, worst case in exactly 7 steps.

Kaprekar found this constant in 1949. Nobody has fully explained why 6174 and essentially nothing else behaves this way in four digits.

[nebulica @nebulica]

Can you reverse the spin of this sphere?

[nebulica @nebulica]

“The book of nature is written in the language of mathematics.”

— Galileo Galilei

[nebulica @nebulica]

“I, a universe of atoms, an atom in the universe.”

— Richard Feynman

[quotesophy @quotesophy]

"Until it's done, tell none. That's Law.”

— Quotesophy

[nebulica @nebulica]

“Nature is pleased with simplicity.”

— Isaac Newton