11.1.1. Buoyancy, Metacentre, Stability and Rigid Body Motion

Try these first

1. 1.

   Define buoyancy.

   Hint

   Think about why objects float.

2. 2.

   What is Archimedes' principle?

   Hint

   Consider the relation between an object's weight and the fluid it pushes away.

3. 3.

   What does Archimedes' principle state?

   • An object sinks if it's heavier than the fluid.
   • The buoyant force is equal to the weight of the fluid displaced.
   • All objects float in water.

   Hint

   Think of the force acting on submerged objects.

4. 4.

   Is buoyancy a downward force?

   • True
   • False

   Hint

   Remember how it allows things to float.

5. 5.

   Calculate the buoyant force on a 10 kg object submerged in water (density = 1000 kg/m³).

   Hint

   Use the formula for buoyancy: Buoyant force = density * volume * g.

6. 6.

   An object has a center of gravity below its metacenter. Discuss the implications for its stability in water.

   Hint

   Think about how the forces interact when disturbed.