The direction of buoyant force is always upwards, perpendicular to the surface of a fluid, regardless of the shape or size of the object.
The direction of buoyant force is determined by the density of the fluid and the volume of the object immersed in it. The greater the density of the fluid, the greater the buoyant force will be. Similarly, the more volume the object takes up in the fluid, the more buoyant force it will experience.
No, the direction of buoyant force remains the same regardless of the depth. It will always act in an upward direction, perpendicular to the surface of the fluid.
The upward direction of buoyant force is what allows objects to float in a fluid. If the buoyant force is greater than the weight of the object, it will float. If the weight is greater, the object will sink. This is why objects with greater volume, such as a ship, can float even if they are made of heavy materials like steel.
The direction of buoyant force is a fundamental property of fluids and cannot be changed. However, the overall force acting on an object can be changed by altering the object's density or volume, which will affect the amount of buoyant force it experiences.