Lesson Notes By Weeks and Term v4 - SHS 1
DYNAMICS
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DYNAMICS
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Subject: Physics
Class: SHS 1
Term: 1st Term
Week: 9
Grade code: 1.1.4.LI.2
Strand code: 1
Sub-strand code: 4
Content standard code: 1.1.4.CS.1
Indicator code: 1.1.4.LI.2
Theme: MECHANICS AND MATTER
Subtheme: DYNAMICS
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Good morning, class. Every day, we see vehicles like "trotros," taxis, and large trucks stop safely, even when moving at high speed. We also see mechanics at Abossey Okai or Magazine easily lift heavy cars with a simple pump jack. How is this possible? How can a small push with a foot or a hand create such a powerful force? The answer lies in a fundamental principle of physics called Pascal's Principle, which is the engine behind all hydraulic systems. Today, we will explore this principle and understand how it makes our roads safer and heavy work much easier.
A. Pascal's Principle
This is the foundational concept for our entire lesson.
Definition: Pascal's Principle states that pressure applied to an enclosed, incompressible fluid is transmitted undiminished to every portion of the fluid and to the walls of the containing vessel. Enclosed fluid: The liquid (e.g., oil, water) is trapped in a container or system of pipes with no way to escape. Incompressible fluid: This means the liquid cannot be easily squeezed into a smaller volume. Liquids are excellent for this, while gases are not. Transmitted undiminished: The pressure you create at one point in the fluid is the exact same pressure felt at *every other point* in that fluid, no matter the shape of the container.
Imagine squeezing a sealed plastic bag full of water. The pressure you apply with your hand is felt equally on all inner surfaces of the bag.