Lesson 3: Archimedes' Principle and Buoyancy
Duration of Days: 3
Lesson Objective
Experimentally derive Archimedes' Principle by measuring the weight of displaced water and using free-body diagrams to predict whether an object will sink, float, or achieve neutral buoyancy.
Why can a solid steel block sink like a stone, while a massive cruise ship made of that exact same steel floats gracefully on the ocean?
What physical quantity dictates how much an object's apparent weight will decrease when it is dropped into a tank of water?
How do submarines alter their physical properties to actively choose whether to sink, float, or hover perfectly still underwater?
Buoyant Force
Archimedes’ Principle:
Displacement
Apparent Weigh
Neutral Buoyancy
HS-PS2-1: Analyze data to support the claim that Newton’s second law of motion describes the mathematical relationship among the net force on a macroscopic object, its mass, and its acceleration. (Applied to buoyant forces and pressure differentials).
To apply Newton's Second Law to fluids, analyzing the upward buoyant force as a direct consequence of the hydrostatic pressure differences between the top and bottom of a submerged object.
How a life jacket saves a swimmer: A life jacket is filled with highly porous, low-density materials (like foam or trapped air). When worn, it drastically increases the swimmer’s total volume while adding negligible mass. According to Archimedes' principle, this massive increase in displaced water volume creates a giant upward buoyant force, easily keeping the person's head safely above water.
MPS Science Differentiation Strategies
https://tinyurl.com/5n6c24k7
Unit 7 Assessment