physics.bu.edu/~duffy/semester1/c23_buoyant.html
The buoyant force. When an object is placed in a fluid, the fluid exerts an upward force we call the buoyant force. The buoyant force comes from the pressure exerted on the object by the fluid. Because the pressure increases as the depth increases, the pressure on the bottom of an object is always larger than the force on ..
What is a buoyant force? Be sure to give and explain an example.
2 answers
You have a smooth pond.
You fill a balloon with water and hold it in your hand.
You have to hold it up
Put it in the pond.
You can hold it without any force up or down from it on your hand.
The water in the pond is holding it up with exactly the weight of the water in the balloon.
Now imagine the water in the balloon is sucked out but you had covered the outside of the balloon with weightless glue so it held its shape.
The force up from the pond did not change. It is equal to the weight of the water you took out of the balloon and now you have to hold the balloon down :)
Yes, I am a ship designer.
You fill a balloon with water and hold it in your hand.
You have to hold it up
Put it in the pond.
You can hold it without any force up or down from it on your hand.
The water in the pond is holding it up with exactly the weight of the water in the balloon.
Now imagine the water in the balloon is sucked out but you had covered the outside of the balloon with weightless glue so it held its shape.
The force up from the pond did not change. It is equal to the weight of the water you took out of the balloon and now you have to hold the balloon down :)
Yes, I am a ship designer.