volume_mute
Floating Equilibrium Force
publish date: 2026/05/18 21:36:3.424617 UTC
volume_mute
A block of wood weighing \(35\text{ lb}\) is dropped into a lake. It breaks the surface and then comes to rest, floating stably. What is the exact value of the upward buoyant force acting on the wood while it floats?
Correct Answer
35 lb
Explanation
When an object is floating in static equilibrium at the surface, the net vertical force must be zero. Therefore, the upward buoyant force must exactly balance the downward gravitational weight of the object, which is \(35\text{ lb}\).
Reference
Basic Physics: A Self-Teaching Guide