1.4. Buoyant Force

Try these first

1. 1.

   Define buoyant force.

   Hint

   Think about what happens when an object is placed in water.

2. 2.

   What is the center of pressure?

   Hint

   Consider how pressure increases with depth.

3. 3.

   What is the buoyant force?

   • Downward force
   • Upward force
   • Horizontal force

   Hint

   Think about how fluids react to submerged objects.

4. 4.

   True or False: The center of pressure is always at the centroid.

   • True
   • False

   Hint

   Recall our discussions about pressure gradients.

5. 5.

   An object with a volume of 3 m³ is submerged in water. Calculate the buoyant force acting on it, assuming the specific weight of water is 9.81 kN/m³.

   Hint

   Use the specific weight of the fluid and the volume of the submerged object.

6. 6.

   A wedge-shaped object is submerged in mercury with a specific weight of 13.6 kN/m³. Its base measures 0.5 m², and the centroid is submerged 0.8 m deep. What is the resultant buoyant force?

   Hint

   Calculate with the specific weight of mercury for accurate results.