Physics
Physics
Problem
A block of wood floats on the surface of some water. Which of the following statements about the block may be incorrect? a. The net vertical force on the block is zero. b. The density of the block is the same as the density of water. c. The buoyancy force acting on the block is equal in size to the weight of the block. d. The density of the block cannot be greater than the density of water.Intuitive explanation
Buoyancy problems hinge on understanding that a floating object is in equilibrium—the buoyant force equals its weight. The key insight is recognizing which statements must be true (like equal weight and buoyant force) versus which could be false (like claims about density ratios, volume submerged, or comparisons to other objects). Think about what equilibrium guarantees and what it doesn't.
Intuitive explanation
Buoyancy problems hinge on understanding that a floating object is in equilibrium—the buoyant force equals its weight. The key insight is recognizing which statements must be true (like equal weight and buoyant force) versus which could be false (like claims about density ratios, volume submerged, or comparisons to other objects). Think about what equilibrium guarantees and what it doesn't.