8.3 Fluids and Newton's Laws
Notes
Buoyant force (Archimedes' principle): $F_b=\rho_{fluid}V_{displaced}g$, the weight of the fluid displaced.
- A floating object displaces its own weight of fluid.
Practice
A 0.002 m³ object is fully submerged in water. Buoyant force ($g=10$):
$1000(0.002)(10)$.
The buoyant force equals:
Archimedes' principle.
A floating boat displaces water with weight equal to:
Forces balance.
Ready for more? Take the Unit 8 test.