Logylogyat 13.Why bodies float Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat.

Slides:

Advertisements

Similar presentations

Chapter 13 Forces in Fluids.

Advertisements

Chapter 12 Forces & Fluids.

Chapter 3: Forces & Fluids Review. How can you change the pressure on the ground when you are standing?  Stand on one foot (decrease area)  Change into.

Forces in Fluids Ch. 11.

Chapter 8 Forces in Fluids

11-1/11-2: Pressure and Floating & Sinking

Chapter 11 – Forces in Fluids

Lecture 8b – States of Matter Fluid Copyright © 2009 Pearson Education, Inc.

D. Roberts PHYS 121 University of Maryland Physic² 121: Phundament°ls of Phy²ics I December 1, 2006.

Hydrostatics Fluids at Rest.

Unit 1 Lesson 5 Fluids and Pressure

Iceberg off Newfoundland Density,PressureAndBuoyancy.

Sect. 14.4: Buoyant Forces Archimedes’ Principle

Pressure in Fluid Systems

Density and Buoyancy.

Physical Science Unit: Forces in Fluids.

Pressure. Remember, Gas Volume Changes…  Suppose you have a one liter bottle of air. How much air do you actually have?  A liter of air means little.

Chapter 14 Fluid Mechanics.

 What is a fluid?  Fluid – any material than can flow and that takes the shape of its container.  What are some examples?

* Pressure refers to a force pushing on a surface * Force and pressure are closely related, but are not the same thing * Pressure deals with force and.

Chapter 10 Fluids. Units of Chapter 10 Phases of Matter Density Pressure in Fluids Atmospheric Pressure and Gauge Pressure Pascal’s Principle Measurement.

Chapter 14 Preview Section 1 Fluids and Pressure

Fluids and Motion Pressure – Refers to a force pushing on a surface. Area is the measure of a surface. Calculating Pressure – Pressure (Pa) = Force (N)

Fluid Forces Mrs. Clarici

Ch. 11 Forces in Fluids. Pressure Pressure-force per unit area on a surface Unit of measurement: pascal (Pa): 1 N/m 2 A fluid is any substance that can.

L 13 Fluids [2]: Statics  fluids at rest  More on fluids at rest  How is atmospheric pressure measured?  Buoyancy: How can a steel boat float?

CHAPTER - 10 GRAVITATION CLASS :- IX MADE BY :- MANAS MAHAJAN

Section 2 Properties of Fluids

Fluid Mechanics ICP Chapter 8. Liquids & Gases Have the ability to flow. Flow = the pieces can move around each other. Because they can flow, they are.

Section 3 Behavior of Fluids. I. Pressure Why the tyre of bike, the airbed and basket ball can be firm to work?

The fun never stops.... Liquids and Gases can exert forces. – Examples: waves crashing, wind Liquids and Gases can exert forces. – Examples: waves crashing,

Fluids 101 Chapter 10. Fluids Any material that flows and offers little resistance to changing its shape. –Liquids –Gases –Plasma?

Floating and Sinking. Buoyancy When you pick up an object underwater it seems much lighter due to the upward force that water and other fluids exert known.

Liquids -They always take the shape of their container -They flow or you can pour them.

Pressure. What two parameters determine the density of an object?

Forces in Fluids Chapter 11 State Standard: Unbalanced forces cause changes in velocity. All objects experience a buoyant force when immersed in a fluid.

C HAPTER 11.1 AND 11.2 G UIDED R EADING A NSWERS.

CONCEPTUAL PHYSICS Liquids.

Forces in Fluids Section 6-1 Pressure. Forces in Fluids What is pressure?  A force pushing on a surface How do force and pressure differ?  Your downward.

Density/Bouyancy Calculating Density

Chapter 7 Forces in Fluids.

Chapter 1.2 Notes Pressure. All matter is made up of atoms and molecules. All matter is made up of atoms and molecules. Matter can exist in four states:

Chapter 11 Fluids Fluids are materials that can flow: gases and liquids. Air is the most common gas, and moves from place to place as wind. Water is the.

Forces and Fluids Chapter 12 BIG IDEAS Newton’s laws apply to all forces Gravity is a force exerted by all masses Friction is a force that opposes motion.

Ch 7 Forces in fluids.

Pressure – The result of force distributed over an area – Pressure = Force(in Newton's – N)/area (m 2 ) Pascal (Pa) – SI unit for Pressure – Named after.

Unit 1 Lesson 5 Fluids and Pressure

L 13 Fluids [2]: Statics  fluids at rest  More on fluids at rest  How is atmospheric pressure measured?  Today’s weather Today’s weather Today’s weather.

Density & Buoyancy Physical Characteristics of an Object.

AND THEIR FORCES Fluids. Matter that can flow is called a fluid. “Fluid” does not mean the same thing as “liquid.” Both liquids and gases are called fluids.

Chapter 11 – Forces in Fluids. Pressure The amount of pressure you exert depends on the area over which you exert force. Pressure is equal to the force.

Ying Yi PhD Chapter 11 Fluids 1 PHYS HCC. Outline PHYS HCC 2 Density and Pressure Pressure and Depth in a Static fluid Buoyant Forces and Archimedes’

Chapter 10 Fluids Pressure in Fluids Pressure is defined as the force per unit area. Pressure is a scalar; the units of pressure in the SI system.

FORCES IN FLUIDS CHAPTER 11. Section 11-1 Pressure Pressure - related to the word press - refers to the force pushing on a surface.

Static Fluids AP Physics 2.

Fluids are substances that can flow. That means liquids and gases can flow so they are fluids.

Lots of slides, but little writing…

Chapter 12 Section 2.

Force In Fluids Chapter 11

3.2 Pressure and the Buoyant Force

Floating and Sinking Chapter 11 Section 2.

Physical Science Forces in Fluids.

Chapter 12 Section 1.

Density Density is the mass of unit volume. Unit g/cm3 or kg/m3.

Chapter 12 Section 2.

FORCES IN FLUIDS CHAPTER 11.

Forces in Fluids.

Presentation transcript:

Logylogyat 13.Why bodies float Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat 13.1.Thrust Pressure in Fluids Pressure Exerted by a gas Liquid Pressure Buoyant Force Archimedes’ Principle Relative Density Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat THRUST 13.1.Activity 1)Press your thumb against a piece of paper Now press the pointed end of a pin against the same piece of paper. Do you notice any difference? Answer- When pressed, the pointed end of the pin presses easily through the piece of paper. That does not happen when we press the thumb against the piece of paper. Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat The force acting on an object perpendicular to the surface is called thrust. The thrust on a unit surface area is called pressure. Pressure= thrust/area SI unit of pressure is N/m 2. It is also called pascal in honour of the scientist Blaise Pascle Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat BLAISE PASCAL He was a French physicist and mathematician. He formulated pascal's law of pressure.He constructed mercury Barometer and measuring air pressure. Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat PRESSURE IN FLUIDS Activity  Take two rubber balloon.  Fill one with water and blow air into other.  Now prick both balloons with a pin.  What do you observe? Answer-Water and air both come out of the balloons. Air escapes quickly compared to water and produces a loud sound. Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat FLUIDS Liquids and gases are called fluids. Fluids exert pressure on the base and walls of the container that holds them, due to weight of fluid. Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat PRESSURE EXERTED BY GAS Activity  Take an empty can  Pour small quantity of water in it. Boil this water for a few minutes until the steam has driven out the air.  Now close the can with the stopper tightly.  Allow it to cool by pouring cold water over it.  What do you observe?  Answer- The can gets gradually crushed. Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ? In the atmosphere, the force exerted on the unit surface area by the weight of the air column above it is called the atmospheric pressure. At the sea level it is about 10 5 N/m 2

Logylogyat THINK WHY? Some people feel their ears popping at the top of a mountain. Some people feel breathless as they climb higher and higher on a mountain. Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat LIQUID PRESSURE Pressure increases with the depth and is proportional to the density of the liquid. P d h Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat Buoyant force 1] Take a full bucket of water  Try to push inverted glass bottle into bucket.  What do you experienced?  Answer-we experienced that an upward force on the bottle due to the water in the bucket opposing the downward motion of the bottle. Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat The upward force exerted by a liquid(a fluid an general)on a body completely or partially immersed in it is called upthrust or buoyant. Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat ARCHIMEDES  C – 212 BC  Greek mathematician, physicist and engineer  First to calculate the ratio of a circle’s circumference to it’s diameter (π)  Calculated volumes of various shapes  Discovered the nature of the buoyant force  Inventor of many practical devices:  Catapults, levers, screws, etc. Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat ARCHIMEDES’ PRINCIPLE When a body is immersed partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat DENSITY & RELATIVE DENSITY Ratio of mass to volume is called density. Density = mass / volume SI unit is kg/m 3 and CGS UNIT is g/cm 3. Relative density = density of substance / density of water. It is also called specific gravity of a substance. It has no unit. Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat EXAMPLE Calculate pressure exerted by a screw on the wooden plank if area of contact of the screw is 0.5 mm 2 and its weight is 50 N. Given : Area = 0.5 mm X m 2 weight of the screw = thrust = 50 N pressure = ? Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

10 -6 Solution : pressure = thrust area = x = 100 x N/m 2 Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?

Logylogyat Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ? 2) A metal block having mass 10 kg with its length 50 cm, breadth 20 cm and heigth 10 cm. Calculate pressure exerted by metal block when it is mead to lie on a table top with surface – (a) ABCD (b) DCFE (c) BCFG. Solution : Thurst = Weight of metal block = mg = 10 X 9.8 = 98 N

Logylogyat Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ? (a)For surface ABCD, L = 50 cm, b = 20 cm Area = length X breadth = 50 cm X 20 cm = 1000 cm 2 = 0.1 m 2 Pressure = Thrust Area = = 980 N/m 2

Logylogyat Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ? (b)For surface DCFE, l = 50 b = 10cm Area = length x breadth = 50 cm x 10 cm = 500 cm 2 = 0.05 m 2 pressure = = 98 = 1960 N/m 2 Thrust Area 0.05

Logylogyat Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ? (c) For surface BCFG, l = 20 cm b = 10cm Area = length x breadth = 20cm x 10cm = 200 cm 2 = 0.02 m 2 Pressure = = 98 = 4900 N/m 2 Thrust Area 0.02

Logylogyat EXAMPLE If density of water is 10 3 kg/m 3 and density of copper is 8.9 X 10 3 kg/m 3. Calculate relative density of copp? Given-Density of water-10 3 kg/m 3 density of copper-8.9X10 3 kg/ m 3 Relative density = Density of copper Density of water = 8.9X10 3 kg/m kg/m 3 = 8.9 Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float

Logylogyat Rayat Shikshan Sanstha,Karmaveer Vidyaprabodhini,Madhya vibhag,Satara. Std-9 th Sub-Science &Technology Topic- Logylogyat Logylogyat Why Bodies float ?