* Pressure increases with depth: The deeper you go in a fluid (like water), the more pressure you experience. This is due to the weight of the fluid above pushing down.
* Pressure acts in all directions: Pressure in a fluid isn't just acting downward; it acts equally in all directions. So, the pressure on the top of a submerged object is less than the pressure on the bottom.
* Upward force due to pressure difference: This difference in pressure creates an upward force on the object. The pressure on the bottom is greater, pushing up more strongly than the pressure on the top is pushing down.
The buoyant force is the net upward force resulting from this pressure difference, and it acts directly upward, opposing the force of gravity.
Why not sideways?
* Symmetry: The pressure acting on the sides of the submerged object is roughly the same. Since it's equal and opposite on both sides, it cancels out, leaving no net horizontal force.
* The fluid itself: The fluid surrounding the object is also under pressure, and it prevents any significant sideways movement due to the buoyant force.
In summary: The buoyant force acts upward because the pressure difference between the top and bottom of a submerged object creates a net upward force. It doesn't act sideways because the pressures on the sides cancel each other out.
