Why are bridge piles in water not buoyant?

Of course, it is 0, first of all, you need to know how buoyancy is generated, it is determined by the pressure difference between the upper and lower surfaces of the liquid on the object (pressure on the lower surface - pressure on the upper surface = buoyancy), that is, the lower surface must be under pressure! Numerically equal to the gravity of the liquid, and "the pile is 5 meters high, and the 2 meters above the water surface (the bottom of the pile must be buried in the bottom of the river)" the pressure difference between the liquid on the upper and lower surfaces is 0, so it is not subject to buoyancy. Even if the bridge pile is 5 meters high and does not expose the water, it is not subject to buoyancy (the liquid has no pressure on the stakes at the bottom of the **river), but there is liquid pressure on it on the upper surface, which is not buoyancy.

To sum up, the buoyancy of the bridge pile in the water is 0

Because the bridge piles are connected to the riverbed, this contradicts the principle of generating buoyancy.

It's not that it's not buoyant, because the bottom of the pile is stuck in the dirt, and the buoyancy is generated by the pressure difference between the upper and lower ends, and it's connected to the bridge, and it's the balance of forces inside the object! So ......

The upstairs few are correct except for bbailong0032 and silver wing 5131!

All objects connected to the bottom of the container (note: unlike the sinking bottom, which still has a small gap with the bottom of the container, and the connection is completely absent) is not subject to buoyancy, because the lower surface is not in contact with the water at all, where does the buoyancy come from?

Buoyancy is caused by the pressure of the water on the lower bottom being greater than the pressure of the water on the upper bottom.

Hope it helps! o(∩_o~

The force in the water can be in all directions, the buoyancy of the water is the upward pressure of the water below, the reason why the object floats is because this force is greater than the weight of the object, and the bridge pile has to be driven into the ground. So there is no buoyancy below.

This kind of problem seems to be a bit nonsensical, but in fact, it can be easily solved from the concept. Buoyancy is simply caused by the pressure difference between the two ends of an object.

Looking at the topic, the bridge is connected to the riverbed and the water surface, which is naturally not stressed at both ends.

Buoyancy is formed when the pressure of the lower bottom surface is greater than the pressure of the upper bottom surface, and the lower bottom surface is not subject to the pressure of water, how can there be buoyancy? That's 0!

It's definitely not 0, it will be buoyant as long as it is in the water, it's just that the gravity of the bridge pile is much greater than the buoyancy he receives.

The answer is wrong! Its buoyancy is the volume of the part in the water!

What is buoyancy? The difference in pressure of the liquid on the upper and lower surfaces of an object is formed. Now the upper and lower surfaces of the bridge piles are not stressed, and the buoyancy is naturally zero.

No. You first have to understand the reason for the buoyancy: there is a pressure difference between the upper and lower surfaces of the object, the upward pressure is greater than the downward pressure, and after the two cancel out a part, there is still a part of the upward pressure, and this remaining part is the buoyancy that we talk about next to the gesture.

Now, the bridge pile immersed in water, there is mud underneath it, there is no water on the ridge at all, and there is no upward pressure, so there is no saying that "after the two cancel out a part, there is still a part of the upward pressure, and this surplus part is the buoyancy we call buoyancy", that is to say, there is no buoyancy.

Not subject to buoyancy. Because buoyancy is the difference between the pressure on the lower surface of the object and the pressure on the upper surface, i.e. f float = f below - f up. The lower surface of the bridge pile is directly matched and buried in the Hesun bed, which is not subject to the pressure of the liquid, and f = 0, so it is not subject to buoyancy.

It does not mean that an object is subject to buoyancy when it displaces water, but to understand this problem, we need to understand the nature of buoyancy

The object immersed in the liquid will be subjected to the vertical upward support force of the liquid, which we call buoyancy, and the magnitude of the buoyancy is equal to the pressure difference between the upper and lower sides of the object, but because the bridge pile is buried in the soil, there is no water below it, and it will not be subjected to the upward pressure of the water on it, so there is no buoyancy.

The bridge piles are not buoyant by the water.

Buoyancy The difference in upward pressure experienced by an object immersed in a liquid or gas.

Since the lower part of the pile is driven into the soil, although part of it is submerged in water, it is not subjected to the upward pressure given by the water, only the side pressure (if the pile is not exposed to the water, there is also vertical downward pressure), so there is no "buoyancy" upward pressure difference.

There is no doubt that the bridge piles will be buoyant in the water. Because it is completely consistent with Archimedes' law, which states that the buoyant force experienced by an object is equal to the gravitational force experienced by the part of the liquid it displaces. For example, some wooden piles are buried deep enough in the water and will float up, which indicates that the bridge piles will be buoyant in the water.

Otherwise, the stake does not have to be buried very deep in the water, as long as it is buried a little, which saves labor and time, why not do that.

Answer: No, because the buoyancy is caused by the pressure difference between the upper and lower bottom surfaces of the object, and the lower surface of the bridge pile is not subject to the pressure of water, so the bridge pile will not be buoyant in the water.

The part that is immersed in water is definitely subject to buoyancy, and the part that is exposed is not.