Why is the bouyant force opposite the force of gravity?

Question

For example, why is it that this force pushes boats up and balloons up. Why not down?

Answer 1

In a way, the bouyant force is just an expression of gravity. Due to gravity, there is more pressure acting on the bottom of a submerged object than there is at the top. This difference in pressure (high pressure at the bottom, low pressure at the top) creates the bouyant force. There is more weight against the bottom of the object because of gravity--all the liquid that is above the object presses down upon it--and at a deeper depth that amount is larger.

Answer 2

Another way of saying it is due to gravity: When a boat floats, it pushes some water out of the way making a dent in the surface of water. Gravity works on the water and tries to pull surrounding water into the dent. The effort of the water trying to get into the dent, because of gravity, provides the buoyancy.

Suppose the boat is at a pier and a crane lifts something heavy off the boat. Some water that has been trying to get into the dent succeeds because the boat is no longer as heavy.

Answer 3

Its observed as favourite tension. as an occasion, that must be the strain the floor is exerting up on something like a field that's at relax on the floor. it quite is no longer continuously equivalent and opposite to gravity (that's certainly an acceleration, no longer a tension.. tension of gravity could be mass*gravity), thats provided that the item is at relax without different forces appearing upon it. in case you have, say as an occasion, you're pushing the field down onto the floor and it quite is at relax, the conventional tension could be interior the the strain of gravity plus the strain you're exerting down, and it could be interior the upward direction.

Answer 4

Any object partially or totally immersed in a fluid (air is a compressible fluid) experiences more pressure at the bottom than at the top. Force is pressure times area acted on, so there is more force acting up than there is acting down.

Answer 5

because the buoyancy force is the difference between the weight of displaced water and the replaced air which is lighter and so the bouncy force is upwards

Answer 6

To every action their is reaction equal and oppsite this is simple answer

Answer 7

this is called upthrust