11.3. Fluid at Rest

Try these first

1. 1.

   What is the buoyant force in water for an object displacing 10 kg of water?

   Hint

   Use the relationship that buoyant force equals the weight of displaced fluid.

2. 2.

   Define Archimedes' principle.

   Hint

   Think about how the force is demonstrated in a pool or bath.

3. 3.

   What does Archimedes' Principle state?

   • A submerged object experiences a downward force.
   • A submerged object experiences an upward buoyant force equal to the fluid displaced.
   • Buoyant force increases with depth only.

   Hint

   Think about submerged objects in water.

4. 4.

   True or False: The stability of an object is improved when the center of gravity is above the center of buoyancy.

   • True
   • False

   Hint

   Relation of CG and CB is key in stability.

5. 5.

   A wooden block with a weight of 15 N is placed in water. Calculate the minimum volume of water it displaces to float.

   Hint

   Apply the buoyancy equation effectively.

6. 6.

   Describe how changing the shape of a ship can impact its buoyancy and stability.

   Hint

   Think about the proportions and how water displacement affects floating.