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"The Buoyancy of Water" PPT download
Part 1: Do you have a solution?
Three eggs with the same appearance are required to float up, sink down, and stay still in the water when they are immersed in water.
When the density of the liquid remains constant, if you want to obtain greater buoyancy, you must ____________
Three eggs are placed in a cup, and they are floating, suspended, and sinking respectively. Can you perform a force analysis on them?
note the difference
1. Do you know the difference between "floating", "floating" and "suspended"?
2. What is the difference between “immersed in” and “immersed in”?
Both floating and sinking are unstable states. The floating object will eventually surface and remain in a floating state;
A sinking object will eventually sink to the bottom of the ocean and become stationary.
Buoyancy of water PPT, part 2: conditions for floating and sinking objects
Floating: F float > G substance (ρ liquid > ρ substance)
Float: F float = G substance (ρ liquid > ρ substance)
Suspension: F float = G substance (ρ liquid = ρ substance)
Sinking: F floating < G object (ρ liquid < ρ object)
think
The glutinous rice balls sink when first put into the pot, but why do they float on the water after they are cooked?
Buoyancy of water PPT, part 3: examples
Example 1: Density meter
Directly measure the density of a liquid
① It works based on the principle of F float = G meter when an object floats on the liquid surface.
②The scale lines on the density meter are uneven. From top to bottom, the scale lines become denser and denser, and the scale value becomes larger and larger. When stationary, the scale value facing the liquid surface is the density of the measured liquid and the density of water. ratio.
Example 2:
The ship sails from the river into the sea:
gravity________,
buoyancy________,
The ship will ________ some (fill in "floating" or "sinking")
Example 3: Submarine
Why can submarines dive underwater and surface?
Water Buoyancy PPT, Part 4: Submarine
Working principle: The buoyancy remains unchanged after being immersed in water, and the ups and downs are achieved by changing its own gravity (filling or draining the water tank)
Water Buoyancy PPT, Part 5: Practice
1. Submarines float and dive by changing ________.
When a submarine dives from a depth of 100m to a depth of 200m, the pressure it receives from the water will be ________, and the buoyancy it will receive will be ________.
2. In the picture, A, B, C, and D are four objects with different materials, volumes, and shapes. Their ups and downs are noted in the picture. Try to draw the buoyancy force F and F on each object in the picture. The complete situation of gravity G (as long as the relative magnitude of the force is expressed qualitatively).
3. An iron block with a volume of 200cm3 is half immersed in alcohol. How much buoyant force does it receive? (g is taken as 10N/kg)
Solution: The iron block displaces the volume of alcohol
V row =100 cm3＝1.0×10-4m3
The buoyant force on the iron block
Analyze the buoyancy force exerted on a wooden block immersed in water until it floats on the surface of the water.
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"Buoyancy of Water" PPT courseware:
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"The Buoyancy of Water" PPT:
"Buoyancy of Water" PPT Part One Content: Teaching Objectives: 1. Confirm that water and other liquids will produce buoyancy on objects immersed in them, and confirm that air also has buoyancy. 2. Be able to explore the factors related to the size of buoyancy through experimental methods, and summarize...