Figuring out the Hand Bucket Problem

“If I was water…” Welcome to visualizing problems in a Physics class 👍

You think you understand the world around you and then there is always something like this that comes by...

I liked the bit at the beginning where you start saying no but do the experiment and find you're wrong

I just learned buoyancy on school this month and watching you figuring out what happens reminded me how i reacted when i learned it :)

I understood very little of this, but it makes me happy to see this guy so happy 😂

As a kid you don't really think about it too much. We used to make make big Rock piles out over our heads so we had something to stand on and swim too. We just knew if we could get the rocks into the water we could much more easily carry them underwater out to the Rock pile. SCIENCE!! 😄

I knew the answer but had to pause and think about it for a sec. Then i pressed play and the delivery and the easy to understand logic were way better than what i thought of...such a great explanation delivered in an a great entertaining way. appreciate the effort you put in to find the easiest example to explain this. loved the video!!

Knowing an answer and being able to articulate that to someone else so they understand is two different abilities.

You're pushing down on the water hard enough to displace the water. The force will be the same as the weight of the water displaced. Since the density of water is simple, it's a great way to get a measure of volume for an awkward shape.

I think I need to digest this info but I'll try the experiment, seems fun

Honestly, that seemed like a simple answer to me, that then you made complicated and made me second guess my expectation, only to then bring it back around and confirm my initial thoughts were correct.

Love that you listen to dh&j ! Dftba ! Also I'm a fluid mechanics major, lovely way to explain buoyancy!

not related to the contents of the video but thanks for adding subtitles to your videos, it really helps :)

This is a really helpful explanation. The big question though: does it still work on lemon people?

Pretty much, bouyancy exerts force on fist. Equal and opposite rule means the water experiences the opposite force of buoyancy. Force on fist goes up, force on water goes down. Water scale gets higher, your scale lower

Thank you for explaining this topic so concisely. I just learned about it physics class and it still confuses me sometimes

Awesome! Such an excellent explanation.

I tell my students in physics class that scales DON’T measure weight, they measure the normal force pushing back up on whatever is above it. When we’re standing still on the scale, it just so happens that the amount pushing back up is equal the force of our weight pushing down. When you have scenarios like the one with the hand-water bucket situation, the water itself is already providing upward forces against the hand because buoyancy, therefore the scale doesn’t have to “work” as hard and the apparent weight on the scale appears to change based on the amount of water pushing back against your object! More object submerged, more equal-opposite force from the water down onto its scale, therefore more force from the scale pushing back upward to maintain mechanical equilibrium.

My mind is completely broken

I immediately figured putting your hand in water would be similar effect to putting your hand on a table, creating a force, even if the water is less effective. And in a different direction I guess I wasn't thinking of the term "buoyancy" though