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# PPT: Buoyancy & Floatation Mechanical Engineering Notes | EduRev

## Civil Engineering (CE) : PPT: Buoyancy & Floatation Mechanical Engineering Notes | EduRev

``` Page 1

What Is Buoyancy Force
?When a body is immersed in fluid, an upward
force is exerted by the fluid on the body.
?This upward force is equal to the weight of the
fluid displaced by the body and is called the force
of buoyancy.
Page 2

What Is Buoyancy Force
?When a body is immersed in fluid, an upward
force is exerted by the fluid on the body.
?This upward force is equal to the weight of the
fluid displaced by the body and is called the force
of buoyancy.
What causes buoyant force?
• Buoyant force is the       force on an object
exerted by the surrounding fluid.
• When an object pushes water, the water
pushes back with as much force as it can.
• If the water can push back as hard, the object
floats (boat).  If not, it sinks (steel).
Page 3

What Is Buoyancy Force
?When a body is immersed in fluid, an upward
force is exerted by the fluid on the body.
?This upward force is equal to the weight of the
fluid displaced by the body and is called the force
of buoyancy.
What causes buoyant force?
• Buoyant force is the       force on an object
exerted by the surrounding fluid.
• When an object pushes water, the water
pushes back with as much force as it can.
• If the water can push back as hard, the object
floats (boat).  If not, it sinks (steel).
Forces Acting on Buoyancy
• The buoyant force is caused by the difference
between the pressure at the top of the object
(gravitational force), which pushes it
downward, and the pressure at the bottom
(buoyant force), which pushes it upward
• Since the pressure at the bottom is always
greater than at the top, every object
submerged in a fluid feels an upward buoyant
force.
Page 4

What Is Buoyancy Force
?When a body is immersed in fluid, an upward
force is exerted by the fluid on the body.
?This upward force is equal to the weight of the
fluid displaced by the body and is called the force
of buoyancy.
What causes buoyant force?
• Buoyant force is the       force on an object
exerted by the surrounding fluid.
• When an object pushes water, the water
pushes back with as much force as it can.
• If the water can push back as hard, the object
floats (boat).  If not, it sinks (steel).
Forces Acting on Buoyancy
• The buoyant force is caused by the difference
between the pressure at the top of the object
(gravitational force), which pushes it
downward, and the pressure at the bottom
(buoyant force), which pushes it upward
• Since the pressure at the bottom is always
greater than at the top, every object
submerged in a fluid feels an upward buoyant
force.
Keep It Simple
• Buoyancy= “the floating force”
• Water is “heavier” than the object…so the
object floats
• Low density-more likely to float
• Buoyant force is measured in Newtons (N)
Page 5

What Is Buoyancy Force
?When a body is immersed in fluid, an upward
force is exerted by the fluid on the body.
?This upward force is equal to the weight of the
fluid displaced by the body and is called the force
of buoyancy.
What causes buoyant force?
• Buoyant force is the       force on an object
exerted by the surrounding fluid.
• When an object pushes water, the water
pushes back with as much force as it can.
• If the water can push back as hard, the object
floats (boat).  If not, it sinks (steel).
Forces Acting on Buoyancy
• The buoyant force is caused by the difference
between the pressure at the top of the object
(gravitational force), which pushes it
downward, and the pressure at the bottom
(buoyant force), which pushes it upward
• Since the pressure at the bottom is always
greater than at the top, every object
submerged in a fluid feels an upward buoyant
force.
Keep It Simple
• Buoyancy= “the floating force”
• Water is “heavier” than the object…so the
object floats
• Low density-more likely to float
• Buoyant force is measured in Newtons (N)
How do you Calculate B
F
?
Buoyant Force= Weight of displaced fluid
OR
B
F
=   W
air
- W
water
Buoyant     =   Weight of         - Weight of object
Force               object in air in water
```
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## Fluid Mechanics

47 videos|82 docs|73 tests

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