Podcast
Questions and Answers
What is another term for the upward force exerted on a body immersed in a fluid?
What is another term for the upward force exerted on a body immersed in a fluid?
When a can is fully submerged in water, what happens to the force required to keep it submerged?
When a can is fully submerged in water, what happens to the force required to keep it submerged?
In the case of a cork floating on the surface of the water, which condition allows it to float?
In the case of a cork floating on the surface of the water, which condition allows it to float?
What needs to happen for an object to move upward in a fluid?
What needs to happen for an object to move upward in a fluid?
Signup and view all the answers
During which experiment is the upward force felt when pushing an empty can deeper into the water?
During which experiment is the upward force felt when pushing an empty can deeper into the water?
Signup and view all the answers
How does the upthrust change as a can or cork is pushed deeper into the water?
How does the upthrust change as a can or cork is pushed deeper into the water?
Signup and view all the answers
What is the correct statement regarding upthrust and lighter bodies like balloons?
What is the correct statement regarding upthrust and lighter bodies like balloons?
Signup and view all the answers
What condition must be true for an object to remain immersed in a liquid?
What condition must be true for an object to remain immersed in a liquid?
Signup and view all the answers
Study Notes
Upthrust in Fluids, Archimedes' Principle and Floatation
- Buoyancy, upthrust (FB), definition, different cases, experimental determinations of relative density (R.D.) of a solid.
- Scope: Buoyancy, Archimedes' principle, properties of upthrust, and floating objects. Examples include application to ships, submarines, icebergs, balloons.
- Archimedes' principle: Relationship between the density of a floating body and the density of the fluid in which it is floating, and the fraction of the volume immersed.
- Principle of flotation: Density of the floating body is related to the density of the liquid in which it floats.
- Simple numerical problems on Archimedes' principle.
- Application to ships and submarines relating calculation and floatation.
Buoyancy and Upthrust
- When a body is partially or wholly immersed in a liquid, an upward force acts on it. This upward force is known as upthrust or buoyant force (FB).
- The upward force exerted on a body by the fluid in which it is submerged, is called the upthrust or buoyant force.
- The property of a liquid to exert an upward force on a body immersed in it is called buoyancy.
- Experiments demonstrate buoyancy
- Pushing an empty can into water: If you push a can into water, you feel an upward force opposing the push. The more you push the can underwater the bigger the upward force becomes until the can is fully submerged.
- Pushing a cork into water: A cork placed on the surface of water floats, with some of its volume underwater. If the cork is submerged and released, it returns to the surface.
- Explanation:
- When a can or cork is placed in water, two forces act on it: (i) its weight (W) pulling downwards and (ii) the upthrust (FB) pushing upwards.
- It floats when the two forces are equal in magnitude (W=FB).
- When the can or cork is pushed deeper the upward force increases until it becomes maximum (F'B) when it is completely immersed.
- When released, if F'B is greater than W, it will rise to the surface. If F'B is less than W, it continues downwards until W=FB
- To keep the object immersed, an external force (F’B-W) is required.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge on buoyancy, upthrust, and Archimedes' Principle with this quiz. Explore the relationship between density, flotation, and the applications of these principles in real-world scenarios like ships and submarines. Solve numerical problems to enhance your understanding of these concepts.
