View by Category

Loading...

PPT – Archimedes Principle PowerPoint presentation | free to download - id: 21ab28-YmM1M

The Adobe Flash plugin is needed to view this content

About This Presentation

Write a Comment

User Comments (0)

Transcript and Presenter's Notes

Archimedes Principle

- Physics 202
- Professor Lee Carkner
- Lecture 2

PAL 1 Fluids

- Column of water to produce 1 atm of pressure
- P rgh
- P
- r 1000 kg/m3
- g 9.8 m/s2
- h P/rg
- Double diameter, pressure does not change
- On Mars pressure would decrease
- Mars has smaller value of g

Archimedes Principle

- What happens if you put an object in a fluid?
- Called the buoyant force
- If you measure the buoyant force and the weight

of the displaced fluid, you find - An object in a fluid is supported by a buoyant

force equal to the weight of fluid it displaces - Applies to objects both floating and submerged

Will it Float?

- Density
- An object less dense than the fluid will float
- A floating object displaces fluid equal to its

weight - A sinking object displaces fluid equal to its

volume

Floating

- How will an object float?
- The volume of fluid displaced is proportional to

the ratio of the densities - Example ice floating in water,
- riVigrwVwg
- VwVi (ri/rw)
- rw 1024 kg/m3 and ri 917 kg/m3

Ideal Fluids

- Steady --
- Incompressible -- density is constant
- Nonviscous --
- Irrotational -- constant velocity through a cross

section - The ideal fluid approximation is usually not very

good

Moving Fluids

- What happens if the pipe narrows?
- Avr constant
- If the density is constant then,
- Av constant R volume flow rate
- Constricting a flow increases its velocity
- Because the amount of fluid going in must equal

the amount of fluid going out - Or, a big slow flow moves as much mass as a small

fast flow

Continuity

- RAvconstant is called the equation of

continuity - You can use it to determine the flow rates of a

system of pipes - Cant lose or gain any material

The Prancing Fluids

- How can we keep track of it all?
- The laws of physics must be obeyed
- Neither energy nor matter can be created or

destroyed

Bernoullis Equation

- Consider a pipe that bends up and gets wider at

the far end with fluid being forced through it - Wg -Dmg(y2-y1) -rgDV(y2-y1)
- The work of the system due to pressure is,
- WpFdpAdDpDV-(p2-p1)DV
- D(1/2mv2)1/2rDV(v22-v12)
- p1(1/2)rv12rgy1p2(1/2)rv22rgy2

Consequences of Bernoullis

- Fast moving fluids exert less pressure than slow

moving fluids - This is known as Bernoullis principle
- Energy that goes into velocity cannot go into

pressure - Note that Bernoulli only holds for moving fluids

Bernoulli in Action

- Blowing between two pieces of paper
- Convertible top bulging out
- Airplanes taking off into the wind

Lift

- If the velocity of the flow is less on the bottom

than on top there is a net pressure on the bottom

and thus a net force pushing up - If you can somehow get air to flow over an object

to produce lift, what happens?

Deriving Lift

- Use Bernoullis equation
- pt1/2rvt2pb1/2rvb2
- The difference in pressure is
- pb-pt1/2rvt2-1/2rvb2
- (Fb/A)-(Ft/A)1/2r(vt2-vb2)
- L (½)rA(vt2-vb2)

Next Time

- Read 15.1-15.3
- Homework Ch 14, P 37, 42, 47, Ch 15, P 6, 7

Which of the following would decrease the

pressure you exert on the floor the most?

- Doubling your mass
- Doubling the mass of the earth
- Doubling your height
- Doubling the size of your shoes
- Doubling air pressure

Which of the following would increase the

pressure of a column of fluid of fixed mass the

most?

- Doubling the width of the column
- Halving the density of the fluid
- Halving the mass of the Earth
- Halving the speed of the Earths rotation
- Doubling the height of the column

Summary Fluid Basics

- Density rm/V
- PressurepF/A
- On Earth the atmosphere exerts a pressure and

gravity causes columns of fluid to exert pressure - Pressure of column of fluid
- pp0rgh
- For fluid of uniform density, pressure only

depends on height

Summary Pascal and Archimedes

- Pascal -- pressure on one part of fluid is

transmitted to every other part - Hydraulic lever -- A small force applied for a

large distance can be transformed into a large

force over a short distance - FoFi(Ao/Ai) and dodi(Ai/Ao)
- Archimedes -- An object is buoyed up by a force

equal to the weight of the fluid it displaces - Must be less dense than fluid to float

Summary Moving Fluids

- Continuity -- the volume flow rate (RAv) is a

constant - fluid moving into a narrower pipe speeds up
- Bernoulli
- p11/2rv12rgy1p21/2rv22rgy2
- Slow moving fluids exert more pressure than fast

moving fluids

About PowerShow.com

PowerShow.com is a leading presentation/slideshow sharing website. Whether your application is business, how-to, education, medicine, school, church, sales, marketing, online training or just for fun, PowerShow.com is a great resource. And, best of all, most of its cool features are free and easy to use.

You can use PowerShow.com to find and download example online PowerPoint ppt presentations on just about any topic you can imagine so you can learn how to improve your own slides and presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows - with 2D and 3D transitions, animation, and your choice of music - that you can share with your Facebook friends or Google+ circles. That's all free as well!

For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!

You can use PowerShow.com to find and download example online PowerPoint ppt presentations on just about any topic you can imagine so you can learn how to improve your own slides and presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows - with 2D and 3D transitions, animation, and your choice of music - that you can share with your Facebook friends or Google+ circles. That's all free as well!

For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!

presentations for free. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free. Or use it to upload your own PowerPoint slides so you can share them with your teachers, class, students, bosses, employees, customers, potential investors or the world. Or use it to create really cool photo slideshows - with 2D and 3D transitions, animation, and your choice of music - that you can share with your Facebook friends or Google+ circles. That's all free as well!

For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!

For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. But aside from that it's free. We'll even convert your presentations and slide shows into the universal Flash format with all their original multimedia glory, including animation, 2D and 3D transition effects, embedded music or other audio, or even video embedded in slides. All for free. Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations and photo slideshows for a fee or free or not at all.) Check out PowerShow.com today - for FREE. There is truly something for everyone!

Recommended

«

/ »

Page of

«

/ »

Promoted Presentations

Related Presentations

Page of

Home About Us Terms and Conditions Privacy Policy Contact Us Send Us Feedback

Copyright 2017 CrystalGraphics, Inc. — All rights Reserved. PowerShow.com is a trademark of CrystalGraphics, Inc.

Copyright 2017 CrystalGraphics, Inc. — All rights Reserved. PowerShow.com is a trademark of CrystalGraphics, Inc.

The PowerPoint PPT presentation: "Archimedes Principle" is the property of its rightful owner.

Do you have PowerPoint slides to share? If so, share your PPT presentation slides online with PowerShow.com. It's FREE!

Committed to assisting Augustana University and other schools with their online training by sharing educational presentations for free