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"The Floating and Sinking of Objects" Buoyancy PPT Courseware 3
Scenario introduction
Why do giant steel ships like the Titanic float on the sea?
Why did the Titanic sink after hitting an iceberg?
What exactly determines whether an object floats or sinks?
collaborative inquiry
Research point: The sinking and floating conditions of objects
The floating and sinking of an object depends on the buoyancy and gravity exerted on the object.
The floating and sinking conditions of objects:
(1) F float > G, float up
The inevitable result of floating is - floating
(F float = G)
(2) F float < G sink
The result of sinking - sinking to the bottom
(F float + N = G)
(3) F float = G float
Floating and sinking conditions V row = V object
Float up F float > G ρ liquid > ρ matter
Suspension F float = G ρ liquid = ρ matter
sink F float < G ρ liquid < ρ object
discuss:
A solid object is immersed in a liquid. Can you judge whether the object will float or sink based on the relationship between the density of the object and the density of the liquid?
Conclusion: ρ substance = ρ liquid suspension
ρ object > ρ liquid sinks
ρ substance＜ρ liquid floats
In-class training
1. Three small balls of the same volume are immersed in water. When they come to rest, which one of them experiences a greater buoyant force?
The buoyant force on the plastic ball and the iron ball is equal and maximum.
The wooden ball experiences the least buoyant force.
2. Two iron balls of the same volume are placed in water and mercury respectively. Which one experiences greater buoyancy?
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"The Floating and Sinking of Objects" Buoyancy PPT Courseware 4:
"The Floating and Sinking of Objects" Buoyancy PPT Courseware 4 New knowledge to sort out the floating and sinking conditions of an object. When the buoyancy force _________gravity, the object floats; when the buoyancy force________gravity, the object sinks; when the buoyancy force________gravity, the object In a suspended or floating state. ..
"The Floating and Sinking of Objects" Buoyancy PPT Courseware 2:
"The Floating and Sinking of Objects" Buoyancy PPT Courseware 2 Review 1. The definition of buoyancy: 2. The direction of buoyancy: 3. Factors affecting buoyancy: liquid, V displacement 4. The formula of buoyancy F float = G F pull F float = G Discharge = liquid V discharge g Think? Immerse objects in water. Some objects...
"The Floating and Sinking of Objects" Buoyancy PPT Courseware:
"The Floating and Sinking of Objects" Buoyancy PPT Courseware Learning Objectives 1. Know the floating and sinking conditions of objects; 2. Understand the application of physical knowledge in production, life and society through the practical application of floating and sinking conditions; 3. Know the density meter and salt water selection The origin of species, submarines, and hot air balloons..