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Tuesday, April 13, 2021

The Physics of That Spinning Hug in Dua Lipa’s Music Video

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Nice, now let’s use these similar concepts to indicate why you’ll be able to’t hug somebody whereas leaning tremendous far again (until you might be on an superior rotating platform). Truly, simply to make issues simpler I’m going to attract the forces on a single human that’s simply doing a brilliant lean again.

Illustration: Rhett Allain

Even when these two forces (gravitational and regular) have the identical magnitudes, the overall torque won’t be zero. Utilizing the foot contact as the purpose of rotation, the conventional pressure has zero torque (torque arm of zero), however the gravitational pressure does certainly have a non-zero torque. The overall torque will trigger this glad leaning human to tip over and hit the bottom. Now a tragic human. Unhappy human on the bottom.

Then what the heck retains these dancers from falling over? The reply is a pretend pressure. Sure, a pressure that is not really a pressure however as a substitute a pretend pressure. Oh, you’ve got by no means heard of a pretend pressure? Nicely, perhaps that is true, however I am positive you have got felt a pretend pressure.

Think about the next scenario. You’re sitting in your automotive at a pink mild (the automotive is not transferring). At this second, there are simply two forces appearing on you. There’s the downward pulling gravitational pressure and the upward pressure from the seat. Since you are not accelerating, these two forces have equal and reverse magnitudes.

Oh, however wait! There’s this goofy trying automotive within the lane subsequent to you. The sunshine turns inexperienced, so that you hit the gasoline and speed up (safely and throughout the posted pace limits in fact). What occurs subsequent? You’re feeling it, proper? There’s some pressure pushing you again into your seat as you speed up. It feels just like the “weight of the acceleration” or one thing, proper? That is really Einstein’s equivalence precept. It states which you can’t inform the distinction between an acceleration and a gravitational pressure. So, in a way this pressure you’re feeling is as actual as gravity—so far as you’ll be able to inform.

The connection between forces and acceleration (Newton’s second legislation) solely works in a non-accelerating reference body. If you happen to drop a ball on this accelerating automotive, it may transfer as if there was some pressure pushing it in the wrong way because the acceleration of the automotive. We will add a “pretend pressure” that is proportional to the acceleration of the automotive and growth—Newton’s second legislation works once more. It is actually fairly helpful.

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