Tag Archive: physics

Three Perplexing Physics Problems

Why does shaken soda explode? Does ice melt first in fresh or salt water? Veritasium explains.

Why Gravity is NOT a Force

The General Theory of Relativity tells us gravity is not a force, gravitational fields don’t exist. Objects tend to move on straight paths through curved spacetime.

Pulse Jet Engine in Slow-Mo

The Slow Mo Guys haven’t been able to get together since the pandemic, but they’re still putting out videos!

Yes, and surprisingly well, it turns out. In explanation to the “coney-joney” effect, commenter Benjamin Hackett says,

“The beautiful coney-joney was first discussed by Hertz back in 1881 and has henceforth become known as Hertzian cone cracks. They typically occur when a hard spherical object is pressed into the surface of a brittle material. In this case, the sphere itself is made of a brittle material (glass) and is “pressed” into the steel plate when it impacts, but the same effect is present. The cone-shape is caused by the propagation of a crack. The crack begins its life as a ring just outside of the region that’s in contact with the plate, where the tensile stresses (the kind that pull a crack open) are at their highest. The crack generally then grows orthogonally away from the surface for a short distance before turning and heading away at a coney-joney angle. The path followed is one that maximizes the release of stored strain energy (the same sort of energy that is stored when you pull back a rubber band). The maximal strain energy releasing path is ultimately guided by the local magnitude of the stress fields (similar in concept to the gradient of the pressure levels in the glass upon impact) near the leading edge of the crack. All in all, for spherical contact such as this, the stress fields basically say to the crack, go be a cone, it’s the best release. Source: PhD in this area”

Filming at 1000fps in Reverse

Gav of The Slow Mo Guys tries to film a cheeky slow mo guys video, but someone has already done it… sort of.

Hulk Fist vs Concrete Slabs

The lads at How Ridiculous aim to find out how many slabs the fist can crush.

YouTuber and NASA scientist Mark Rober spent 8 months, 150 tests and over 1,000 total working hours to break a Guinness World record, but also put on the most EPIC birthday party a kid ever had.

The boys from How Ridiculous whip up a batch of oobleck to see how it reacts to the Hulk Fist!

Hulk Fist Smashes Everything

660 pounds of solid steel.

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