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Buoyancy
Pressure in a Fluid
• Objects in a fluid
experience an
buoyant
force which can
make them float.
• Liquids and gases are fluids—materials
that can flow and have no definite shape.
3.2 Pressure and the Buoyant Forces
Pressure and Depth
• The water more water above
you, the more pressure you feel.
3.2 Pressure and the Buoyant Forces
Pressure in All Directions
• Horizontal pressures cancel each other out.
3.2 Pressure and the Buoyant Forces
Buoyant Force and Depth
• The bottom of the fish is deeper, so there is more
force pushing up on it – a buoyant force.
3.2 Pressure and the Buoyant Forces
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).
3.2 Pressure and the Buoyant Forces
Archimedes’ Principle
• states that the buoyant force is equal to the
weight of the fluid the object displaces.
• 1 cm3 of steel weighs more than the 1 cm3 of water
it displaces, so it sinks. 1 cm3 of ice weighs less and
so it is pushed up.
Newton’s 3rd
Law – an
object can
push back
with no
more force
than it can
push.
How to measure the buoyant force
• Weight of object in air - weight of object
in water = upward buoyant force.
• The buoyant force is equal to the weight
of the displaced waterObject’s weight in air -
object’s weight in water
= Buoyant Force
= Weight of displaced water
Pressure is the ____ per unit area.
A mass
B volume
C force
D pascal
3.2 Pressure and the Buoyant Forces
A
B
C
D
0% 0%0%0%
1. A
2. B
3. C
4. D
Which direction does the buoyancy force
act on an object?
A upward
B downward
C to the left of the object
D to the right of the object
3.2 Pressure and the Buoyant Forces
A
B
C
D
0% 0%0%0%
1. A
2. B
3. C
4. D
Where is the pressure the greatest on
an object in a fluid?
A top
B bottom
C sides
D none of the above
3.2 Pressure and the Buoyant Forces
A
B
C
D
0% 0%0%0%
1. A
2. B
3. C
4. D

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Buoyancy.ppt

  • 2. Pressure in a Fluid • Objects in a fluid experience an buoyant force which can make them float. • Liquids and gases are fluids—materials that can flow and have no definite shape. 3.2 Pressure and the Buoyant Forces
  • 3. Pressure and Depth • The water more water above you, the more pressure you feel. 3.2 Pressure and the Buoyant Forces
  • 4. Pressure in All Directions • Horizontal pressures cancel each other out. 3.2 Pressure and the Buoyant Forces
  • 5. Buoyant Force and Depth • The bottom of the fish is deeper, so there is more force pushing up on it – a buoyant force. 3.2 Pressure and the Buoyant Forces
  • 6. 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). 3.2 Pressure and the Buoyant Forces
  • 7. Archimedes’ Principle • states that the buoyant force is equal to the weight of the fluid the object displaces. • 1 cm3 of steel weighs more than the 1 cm3 of water it displaces, so it sinks. 1 cm3 of ice weighs less and so it is pushed up. Newton’s 3rd Law – an object can push back with no more force than it can push.
  • 8. How to measure the buoyant force • Weight of object in air - weight of object in water = upward buoyant force. • The buoyant force is equal to the weight of the displaced waterObject’s weight in air - object’s weight in water = Buoyant Force = Weight of displaced water
  • 9. Pressure is the ____ per unit area. A mass B volume C force D pascal 3.2 Pressure and the Buoyant Forces A B C D 0% 0%0%0% 1. A 2. B 3. C 4. D
  • 10. Which direction does the buoyancy force act on an object? A upward B downward C to the left of the object D to the right of the object 3.2 Pressure and the Buoyant Forces A B C D 0% 0%0%0% 1. A 2. B 3. C 4. D
  • 11. Where is the pressure the greatest on an object in a fluid? A top B bottom C sides D none of the above 3.2 Pressure and the Buoyant Forces A B C D 0% 0%0%0% 1. A 2. B 3. C 4. D