Chad provides a physics lesson on the buoyant force and Archimedes' Principle which states that the buoyant force is equal to the weight of displaced fluid. The lessons begins with an explanation of the nature of the buoyant force and a derivation of the formula for the buoyant force. He then compares the formulas for calculating an object's weight and the buoyant force and explains why objects that are more dense than a fluid sink, while objects that are less dense float. Finally, Chad derives a formula for calculating the percentage of a floating object that is submerged below the surface before solving several buoyant force problems.

The first problem is a simple calculation of the buoyant force give the volume of the object and the density of the fluid. The next two problems demonstrate how an object's density affects the percentage of its volume that is submerged below the surface. The next two problems demonstrate how the buoyant force explains why objects feel lighter under water. Finally, the last problem is a calculation of the density of an object from its apparent weight under water.

00:00 Lesson Introduction
00:47 The Buoyant Force Formula Derivation
05:00 Buoyant Force vs Weight (Float or Sink)
06:51 The Volume Submerged for Floating Objects
12:22 How to Calculate Buoyant Force
14:25 How to Calculate the Percent Submerged for a Floating Object Problem #1
17:28 How to Calculate the Percent Submerged for a Floating Object Problem #2
19:23 How to Calculate the Normal Force for a Submerged Object
23:00 How to Calculate Apparent Weight for a Submerged Object
26:55 How to Calculate the Density of a Submerged Object

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