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"Understanding Buoyancy" Buoyancy PPT courseware
Purpose of inquiry: Are objects sinking in water still affected by buoyancy?
(1) Explore the buoyancy of liquids
Question (1) How much gravity is exerted on the object? Does the gravity decrease during the sinking process? Why?
(2) Will a sinking object be affected by buoyancy when immersed in water? How do you determine the buoyant force acting on an object.
(3) Discuss the direction and magnitude of buoyancy through force analysis and use the knowledge of balance force.
(4) Are only submerged objects subject to the buoyancy of water?
Conclusion 1. An object immersed in a liquid is subject to the vertical upward buoyancy force of the liquid.
2. The size of buoyancy can be measured - weighing method
F float = G-F (F represents the indication of the spring dynamometer, that is, the magnitude of the pulling force)
(2) Explore the buoyancy of air
Question (1) Has the total gravity of the balloon, needle and ball changed?
(2) Why does this side of the ball tilt upward as the balloon grows larger?
Conclusion 3. An object immersed in a gas is subject to the vertical upward buoyancy force of the gas.
Question (3) From the experiment of gas buoyancy, you can guess why the size of the buoyancy force experienced by an object in the gas changes.
(3) Explore the causes of buoyancy
Introduction: Gravity is generated by the attraction of the earth, elastic force is generated by the elastic deformation of objects, liquid has pressure on the bottom of the container due to the action of gravity, and has pressure in all directions due to its fluidity. So, what causes the buoyancy force exerted by liquid on objects immersed in it?
Question (1) Why does an object that can float when immersed in water not float?
(2) When the lower surface of the object is filled with water, is there any force on the lower surface of the object? If so, in what direction is the force directed?
Reading book P171
Conclusion 1. An object immersed in a liquid is subject to the vertical upward buoyancy force of the liquid.
2. The size of buoyancy can be measured - weighing method
F float = G-F (F represents the indication of the spring dynamometer, that is, the magnitude of the pulling force)
3. Objects immersed in gas are subject to the vertical upward buoyancy force of the gas.
4. Cause: F float = F up - F down
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