ME 406 | FLU MECH

Buoyancy

Upward net force on objects within a liquid

Buoyancy

Occurs because pressure in a fluid increases with depth

Buoyancy

Since the bottom is deeper, more force is pushing up than force on the pushing bottom

Buoyancy

Net upward force pushes objects up

Archimedes Principle

The buoyant force on an object is equal to the weight of the fluid displaced by the object

Archimedes Principle

It is not the object that exerts the buoyant force, it is fluid that the object displaces that causes it

Buoyancy

______ is the upward force that an object feels from the water and when compared to the weight of the object, it is what makes an object float, sink or remain neutrally buoyant in the water.

float

When an object floats, the upward buoyant force exerted by the water is greater than the downward force of the weight of the object. You can also understand this concept with numbers. If an object’s density is less than waters density(1g/𝑐𝑚³), it will ______.

Buoyancy (Archimedes Principle)

‘’A body submerged in a fluid is subjected by an unbalanced force called the buoyant force equal to the weight of the displaced fluid.”

Positive buoyancy (Float)

Neutral buoyancy

Negative buoyancy (Sink)

TYPES OF BUOYANCY:

Positive buoyancy (Floating)

Buoyant force is greater than weight so the object floats.

Neutral buoyancy

Buoyant force is equal to the weight so the object is suspended in the fluid.

Negative buoyancy (Sinking)

Buoyant force is less than the weight so the object sinks.

difference

The ______ between the buoyant force and the object’s weight determines whether the object floats or sinks.