How Does Buoyant Force Compare to Weight When an Object is Held Submerged?

In summary, buoyant force is the upward force exerted by a fluid on a submerged object, while weight is the downward force due to gravity acting on an object. Buoyant force can reduce an object's weight when it is submerged, and the weight of an object must be less than the buoyant force for it to float. The density of an object affects its buoyant force and weight, with more dense objects sinking and less dense objects floating. In some cases, buoyant force and weight can be equal if the object is fully submerged and in equilibrium, according to Archimedes' Principle.
  • #1
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Homework Statement



Suppose that an object that would normally float is held submerged How does the buoyant force in this situation compare to its weight? Explain you answer.

Homework Equations


I know that if a floating object isn't held submergered then its weight and buoyant force are equal, However, I am confused about the above situation


The Attempt at a Solution


Not really a problem but I just want to understand
 
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  • #2
What does the buoyant force depend on? How does it change when you submerge the object? (Review Archimedes's principle.)
 
  • #3
something.


In the situation where an object that would normally float is held submerged, the buoyant force is still present but it is now acting in the opposite direction to the weight of the object. This is because when an object is submerged, the water exerts an upward force on it (buoyant force) equal to the weight of the water displaced. However, since the object is being held down, the weight of the object is now greater than the buoyant force.

In this scenario, the buoyant force is still present and is still equal to the weight of the water displaced, but it is not strong enough to overcome the weight of the object. Therefore, the object will not float and will remain submerged.

To summarize, the buoyant force in this situation is still present and equal to the weight of the water displaced, but it is now being opposed by the weight of the object. This is why the object will not float and will remain submerged.
 

Related to How Does Buoyant Force Compare to Weight When an Object is Held Submerged?

1. What is the difference between buoyant force and weight?

Buoyant force is the upward force exerted by a fluid on an object that is partially or fully submerged in it, while weight is the downward force due to gravity acting on an object. Buoyant force is caused by the displacement of fluid by an object, while weight is determined by the mass of the object.

2. How does buoyant force affect an object's weight?

Buoyant force can reduce an object's weight, making it feel lighter, when it is partially or fully submerged in a fluid. This is because the buoyant force opposes the weight of the object, resulting in a net force that is less than the weight of the object alone.

3. What is the relationship between the weight of an object and its ability to float?

The weight of an object must be less than or equal to the buoyant force acting on it in order for it to float. If the weight is greater than the buoyant force, the object will sink. This is why larger and more dense objects typically sink, while smaller and less dense objects are more likely to float.

4. How does the density of an object affect its buoyant force and weight?

The density of an object plays a significant role in determining its buoyant force and weight. Objects with a higher density will sink in a fluid because they displace less fluid and therefore experience a smaller buoyant force. On the other hand, objects with a lower density will float because they displace more fluid and experience a larger buoyant force.

5. Can buoyant force and weight ever be equal?

Yes, buoyant force and weight can be equal if an object is fully submerged in a fluid and is in equilibrium, meaning that there is no net force acting on the object. This is known as the Archimedes' Principle, which states that the buoyant force is equal to the weight of the fluid that is displaced by an object.

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