Heavy Ball Suspended in Water: Find Reading on the Spring Scale and Balance | Buoyancy
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- Опубліковано 12 січ 2022
- A golf ball is suspended in a beaker of water by a string connected to a spring scale. The beaker rests on a scale. Find the reading of both the spring scale and the scale supporting the beaker.
This problem uses archimedes principle, buoyant force, net force, newtons laws and weight to solve for all of the forces acting on the ball.
This problem often comes up in introductory physics courses including mechanics and fluid mechanics.
This is great, thank you!
Glad you liked it!
Perfect thank you!
Glad it helped!
I wondering what if the water going out thru a hole of the cup so, it stay same water level? If the ball made of iron, would it be same number from the scale?
very helpful man can you tell me what happen the spring balance is attached to jar and then we measure the weight
The reading on the scale is the weight of everything it is supporting. Thats the beaker, water and most of the golf ball. If we were to attach the spring scale to the jar, and hang everything from the spring scale, then the spring scale would the total weight of the jar, water and ball.
THANK YOU SIR❤
welcome.
Thanks for the vdo
But can't we just calculate the height rose by water bcz of the ball
And then calculate the net pressure at the bottom and multiply it by the area to get the force with which the container presses the digital scale?
Yes you can
Great video and well presented.
However wouldn't using a different golf ball than the one used in the calculations obscure a useful fact?
Surely the increased reading on the digital scale (in grams) is equal to the volume (in cc) of the golf ball when the liquid is water.
Thus suspending an object by a string, in a container of water that's been tared on a digital scale, would show a reading that's equal to the volume of the object. A quick way to measure the volume & calculate the Density of the object = Mass/Volume.
You make valid points. I chose not to tare the scale because I was worried that having something on the scale (the beaker) with no reading would appear as though I was doing some sort of digital hocus pocus to trick people.
The golf ball size discrepancy came from the fact that I recorded the solution based on an average sized golf ball BEFORE I shot the intro scene. When I did the intro, the only ball I had was a slightly different size.
wait so whats the value on the spring scale?
The value on the spring scale is the weight of the ball minus the buoyant force (the reading on the balance)
why isn't the reading on the digital scale the force of the bouyancy minus the force of the spring
After being zeroed, the digital scale only reads how hard the water is pushing on the sphere (the buoyant force). The scale does not 'know' what else is acting on the sphere.
think there is some thing missing in your calculation ,,,
if the ball 50 gm meanw while what you see on scale is 40 gram extra not 45 ?
You are correct. I actually wrote out the problem on paper using nominal golf ball dimensions before I shot the real life video using the only golf ball I could dig up. As a result I used slightly different dimensions in the calculation than what occurred in real life.
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Physics Rules In The #TearsOfTheKingdom ♿️
Have you ever tested an item that is sinking OR floating upwards in a container of water that is then dropped from a height. The rising or sinking of the object seems to pause as the container falls. What is the reason for this?
There’s another channel that is claiming that gravity isn’t a real force and it’s the planet that’s raising up and when you let go of an object it doesn’t fall but rather the planet rises up to meat it. He’s doing experiments as above and the affects of buoyancy appear to stop on objects floating upwards as the container filled with water fall falls