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"Utilization of Buoyancy" Buoyancy PPT Courseware 3
1. The floating and sinking of an object depends on the extent of ________ and ________ it is subjected to.
2. Floating and sinking conditions
Comparing from two forces
①FloatingFfloating___________G objects
②Sinking F Floating _________G objects
③Suspended F floating _________G matter
④FloatingFfloat___________G object
Compare from density
①Floating liquid _________r
②Sinking liquid________ρ matter
③Suspension liquid________ρ substance
④Floating liquid________ρ objects
Thinking: Can you make plasticine or toothpaste skin float?
Conclusion: When the density of an object is greater than the density of a liquid, if it is made hollow and the average density becomes smaller, it can float on the liquid surface.
Explanation: Using the "hollow" method can increase the available buoyancy.
1. Ship
Principle: To make an object that can float on the water from steel with a density greater than water, it must be made hollow, and the buoyancy force will increase.
Condition: Floating on the liquid surface F float = G object = G row
Displacement (m row):
①The mass of water displaced when the ship is fully loaded.
②M row = m ship + m cargo (full load)
The carrying capacity of a ship is expressed in displacement
2. Submarine
Principle: Float and dive by changing the size of its own gravity.
Features: The buoyancy remains unchanged.
3. Balloons and airships
Principle: By changing its own volume (V row) to change the size of the buoyancy force it experiences, it rises or falls. (air bag)
Features: its own gravity remains unchanged (the density of the gas filled inside is less than the density of air)
How to lower hydrogen balloons and hot air balloons that have risen into the sky?
It achieves descent by reducing its own volume to change the size of the buoyancy force it experiences.
Learn physics with hands and brain
1. A ship with a displacement of 1000t sails in the river. When fully loaded, the total weight of the ship and the cargo it contains is _____N;
The buoyancy force exerted by the river water is _____N;
If the density of river water is 1.0×103kg/m3, the volume of river water displaced by the boat is _____m3. (g=10N/kg)
2. When a ship sails from the sea into the river, the gravity it experiences is _____. It is subject to buoyancy _____. The volume of water it displaces _________.
(Fill in “get bigger, get smaller, stay the same”) Does it float or sink more____.
3. If a submarine is completely submerged in the water and continues to dive, the buoyancy and pressure it will experience will be ( )
A. The pressure becomes smaller and the buoyancy becomes smaller. B. As the pressure increases, the buoyancy becomes smaller.
C. As the pressure increases, the buoyancy force increases. D. The pressure increases and the buoyancy remains unchanged.
4. Xiao Ming used plasticine with a density of 1.5×103kg/m3 to build a “boat”. The volume of the plasticine he used was 20cm3, and the maximum displacement volume of the boat he made was 100cm3. (g is taken as 10N/Kg)
Ask: 1) What is the gravity of the plasticine used? 2) What is the heaviest cargo that the boat he made can carry?
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"Utilization of Buoyancy" Buoyancy PPT Courseware 2:
"Utilization of Buoyancy" Buoyancy PPT courseware 2 Knowledge review: 1. Contents of Archimedes' principle: 2. Calculation method of buoyancy: ①Weighing method F float = G object F pull ②Calculation formula of Archimedes' principle: F buoyancy = liquid gV discharge 3. The reason for buoyancy: the liquid is opposite to...
"Utilization of Buoyancy" Buoyancy PPT courseware:
"The Utilization of Buoyancy" Buoyancy PPT courseware I would like to discuss. During the Three Kingdoms period, Cao Chong was called Xiang. In addition to using boats to weigh things, using boats to lift weights is also a Chinese invention. According to historical records, Huai Bing, a monk from Zhending County, once salvaged iron oxen. He invented the buoyant lifting method. learning target (..