Introductory Physics PHY111 Lecture 9 - PDF

Introductory Physics PHY111 Prof Mohamed Emam-Ismail Prof. Zakaria. M. Abd El-Fattah Prof. Abdelrazek Bedeer Professor of Solid State Physics Professor of Biophysics Faculty of Science, Galala University & Faculty of Science, Galala Un...

Introductory Physics PHY111 Prof Mohamed Emam-Ismail Prof. Zakaria. M. Abd El-Fattah Prof. Abdelrazek Bedeer Professor of Solid State Physics Professor of Biophysics Faculty of Science, Galala University & Faculty of Science, Galala University Al-Azhar University [email protected] [email protected] Lecture9: December 15-17, 2024 Fall 24-25 Lecture 9: Fluids and Viscosity ❑States of Matter ❑Density and Pressure ❑Archimedes' Principle and Buoyancy Force ❑Fluids: An Ideal Fluid ❑Continuity and Bernoulli’s Equations ❑Viscosity and Stokes Law 2 States of Matter: In this lecture we are concerned about fluids; liquids or gases SOLID LIQUID GAS PLASMA Tightly packed, in a regular pattern Well separated with no regular Vibrate, but do not move from place arrangement. Vibrate and move freely at to place. Solid has a definite volume high speeds. an unconfined gas has and shape neither a definite volume nor a definite shape. Close together with no regular arrangement. Has no definite volume or shape and is Vibrate, move about, and slide past each other. a composed of electrical charged particles liquid has a definite volume but no definite shape. 3 States of Matter: Liquid Gas When dealing with fluid some important quantities are to be considered: Examples: Mass density and Pressure 4 Mass Density 𝜌: High Medium Low 5 Average Pressure P: What if the cube is deeper?! Swimming or diving. 6 Average Pressure P: 7 Average Pressure P: Example 1 8 Average Pressure P: Example 2 9 Pressure and Depth: Atmospheric Pressure Pressure and Depth in Static Fluid What is a pressure gauge? 10 Pressure and Depth: Example 11 Archimedes' Principle : Buoyant Forces 12 Archimedes' Principle : Buoyant Forces The magnitude of the buoyant force on an object always equals the weight of the fluid displaced by the object 13 Archimedes' Principle : Buoyant Forces 𝜎 𝜌 𝜎V g mass of the object 14 14 Archimedes' Principle : Floating Objects 𝜎 (object) < 𝜌 (fluid) 𝜎V g mass of the object 15 Archimedes' Principle : Example 16  Classical Mechanics: Work and Energy Lecture 9: Warp Up At this point, you should be familiar with the following: - States of Matter - Pressure and Depth - Archimedes' Principle 𝜎V g mass of the object 17  Thank You Next Lecture: Ideal Fluid, Flow and Viscosity If you need any help write me to: [email protected] [email protected] [email protected] Or show up at my office: Faculty of Basic Science Floor 2 Floor 4, Office No. 5 ACKWONLEDGMENT : Prof. Hassan El-Dessouky Prof. Mohammed Emam-Ismail Assoc. Prof. Afaf El-Sayed