A Question About Buoyancy Force (I Think My Teacher Is Wrong)

Thread starter cnoa
Start date Oct 14, 2011
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Buoyancy Buoyancy force Force Teacher

In summary, buoyancy force is the upward force exerted on an object immersed in a fluid, calculated using Archimedes' principle and represented by the equation F<sub>B</sub> = ρVg. It can be greater than the weight of an object if the object is less dense than the fluid it is immersed in, and the shape of an object can affect its buoyancy force by changing the amount of fluid it displaces. If your teacher's explanation differs, it is important to ask for clarification and continue learning from reliable sources.

Oct 14, 2011

cnoa

How can they be equal at that point? And where is the force that the string applies.

By the way Fk = Buoyancy Force

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Oct 14, 2011

ehild

Homework Helper

It comes from the net torque with respect to the right end of the rod. It has to be zero in equilibrium.

ehild

1. What is buoyancy force?

Buoyancy force is the upward force exerted on an object immersed in a fluid, such as water or air. It is caused by the difference in pressure between the top and bottom of the object, and is equal to the weight of the fluid that the object displaces.

2. How is buoyancy force calculated?

Buoyancy force can be calculated using Archimedes' principle, which states that the buoyant force is equal to the weight of the fluid displaced by the object. This can be represented by the equation F_B = ρVg, where ρ is the density of the fluid, V is the volume of the displaced fluid, and g is the acceleration due to gravity.

3. Can buoyancy force be greater than the weight of an object?

Yes, buoyancy force can be greater than the weight of an object if the object is less dense than the fluid it is immersed in. This is why objects float in water - the upward buoyancy force is greater than the downward force of gravity.

4. How does the shape of an object affect its buoyancy force?

The shape of an object can affect its buoyancy force by changing the amount of fluid it displaces. Objects with larger volumes and less dense materials will have greater buoyancy force, while objects with smaller volumes and denser materials will have less buoyancy force.

5. What if my teacher's explanation of buoyancy force is different?

If your teacher's explanation of buoyancy force differs from what you have learned, it is important to ask for clarification and discuss the concept further. Science is always evolving and there may be different perspectives or approaches to understanding a concept. It is important to keep an open mind and continue learning from reliable sources.