F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.
-
Upload
eustacia-carr -
Category
Documents
-
view
247 -
download
6
Transcript of F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.
![Page 1: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/1.jpg)
![Page 2: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/2.jpg)
Fbuoy
THE BUOYANT FORCE
![Page 3: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/3.jpg)
Fbuoy
HOW BIG IS THE BUOYANT FORCE?
1 m1 m
1 m
![Page 4: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/4.jpg)
Fbuoy
THE CASPER BOX
- no mass
- just holds stuff
1 m1 m
1 m WATER
WE,W = 10,000 N
How big is the buoyant force?
= 10,000 N
![Page 5: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/5.jpg)
Fbuoy
THE CASPER BOX
- no mass
- just holds stuff
1 m1 m
1 m STEEL
WE,S = 78,000 N
How big is the buoyant force?
= 10,000 N
a
![Page 6: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/6.jpg)
Fbuoy
THE CASPER BOX
- no mass
- just holds stuff
1 m1 m
1 m STYRO-FOAM
WE,S = 1,000 N
How big is the buoyant force?
= 10,000 N
a
![Page 7: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/7.jpg)
![Page 8: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/8.jpg)
Archimedes’ Principle:
• The buoyant force acting on an object is equal to the weight of the fluid • displaced by the object, or• that would fill the “Casper Box”
• If an object has greater density than water it will sink
• If an object has smaller density than water it will float
![Page 9: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/9.jpg)
Where will they “float?”
salt water
= 1.2 g/ml
fresh water
= 1.0 g/ml
oil
= 0.9 g/ml
Object A: A = 0.8 g/ml
Object B: B = 0.95g/ml
Object C: C = 1.1 g/ml
Object D: D = 1.3 g/ml
Object E: E = 4.0 g/ml
![Page 10: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/10.jpg)
How can a steel boat float?
![Page 11: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/11.jpg)
![Page 12: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/12.jpg)
![Page 13: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/13.jpg)
![Page 14: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/14.jpg)
![Page 15: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/15.jpg)
![Page 16: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/16.jpg)
![Page 17: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/17.jpg)
The bouyant force is greatest on a ten ton ship if it is floating in:
• A) fresh water
• B) salt water
• C) mercuryWE,b
F(buoy)W,ba = ?
a = 0
• D) all the same
What does change?
![Page 18: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/18.jpg)
![Page 19: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/19.jpg)
THREE BLOCKS
• Which block has the greatest buoyant force?
![Page 20: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/20.jpg)
Which block experiences the largest buoyant force?
WE,1
WE,2
Archimedes’Principle
Fw,1 Fw,2
oak
balsa
![Page 21: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/21.jpg)
What should I remember?
• Archimedes’ Principle always applies, whether an object sinks or floats. • buoyant force is always equal to weight
of fluid displaced.
• If an object floats, the buoyant force is also equal to the object’s weight.
![Page 22: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/22.jpg)
Problem
• A cube of wood 20 cm on each side is placed in a tub of water and is found to sink so that only 6 cm of the block is above the water. What is the density of the wood?
6 cm
20 cm
![Page 23: F buoy THE BUOYANT FORCE F buoy HOW BIG IS THE BUOYANT FORCE? 1 m.](https://reader035.fdocuments.net/reader035/viewer/2022081501/56649efb5503460f94c0e2bb/html5/thumbnails/23.jpg)
Hard problem:
You are floating in a boat in your very own swimming pool (you are rich). There are six gold bricks sitting on the floor of the boat (you are rich). You throw them into the pool. Does the water level of the pool go up or down (or stay the same)?