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NEET UG 2026 » NEET UG Study Material » Physics » Fluid Friction
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Fluid Friction

Fluid friction arises when two fluid layers move. Viscosity is the term for the internal resistance to flow. The viscosity of a fluid is commonly referred to as its "thickness." All genuine fluids are viscous because they resist shearing in some way.

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Fluid friction is the force that prevents a liquid from moving either within itself or through another medium. Internal friction happens as a result of the movement of the molecules within the fluid, while exterior conflict arises as a result of how the fluid interacts with other matter. It refers to the friction that occurs when the layers of a viscous liquid move relative to one another. Viscosity refers to the internal resistance to flow. The higher the ease of movement, the less dense the fluid. Fluid friction is commonly employed in water slides to allow us to gently prompt or slide down.

THEORY

Friction is the force that prevents solid surfaces, fluid layers, and material elements sliding against each other from moving in the same direction.

Friction comes in a variety of forms

  1. Dry friction is the resistance to relative lateral motion between two solid surfaces in contact.

  2. The friction between layers of such a viscous fluid that are bouncing to each other is referred to as fluid friction.

  3. Lubricated friction occurs when two solid surfaces are separated by a lubricant fluid.

  4. Skin friction is a component of drag, which is the force that prevents a fluid from moving across a body’s surface.

  5. Internal friction is the force that opposes motion between the elements that make up a solid substance when it deforms.

What is Fluid Friction, and how does it work?

When two fluid layers move in opposite directions, friction occurs. The internal resistance to flow is referred to as viscosity. The “thickness” of a fluid is the term used to describe its viscosity.

Because they resist shearing in some way, all true fluids are viscous. The concept of an inviscid fluid, or an ideal fluid that provides no resistance to shearing and so is not viscous, can be beneficial.

Fluid Friction Examples

  1. If there is a wet area between thin flexible glass panels, the plates will become caught and the bottom plate will not fall when only the top plate is held.

  2. The magnitude of a splash when an object is dropped in a fluid is determined by the fluid friction of that fluid.

  3. On the surface of a rushing river, lighter dust particles move quickly. This is because the top layer of water has a strong velocity gradient due to reduced dynamic fluid friction.

Friction inside the organisation

Take a look at internal fluid friction first. A fluid seems to be a continuous medium to the naked eye. Fluids, on the other hand, are made up of molecules separated by a significant amount of free space when examined under a high powered microscope. Squeezing honey through a small hole, for example, requires the molecules to move relative to one another by squeezing past or displacing one another. Internal friction is the cause of a fluid’s inability to flow. The more internal friction there is, the more difficult it is to move the molecules and push the fluid to deform. Internal strife, on the other hand, isn’t always a bad thing. For example, without internal friction, you wouldn’t be able to drink through a straw since the fluid wouldn’t be cohesive enough to be carried that way.

Couette Flow is the most common representation of internal friction.

What are five different types of fluid friction examples?

  1. When you stick your hand out a car window, air pushes against it (external)

  2. As a swimmer moves through the water, the water pushes on their body (external)

  3. As you stir your coffee with a spoon, it moves (external)

  4. Taking a sip of water through a straw (internal)

  5. A submarine is navigating through the water (external)

CONCLUSION

Fluid friction arises when two fluid layers move in opposite directions. Viscosity is the term for the internal resistance to flow . Fluid friction is the force that prevents a liquid from moving either within itself or through another medium. Internal friction happens as a result of the movement of the molecules within the fluid, while exterior conflict arises as a result of how the fluid interacts with other matter. It refers to the friction that occurs when the layers of a viscous liquid move relative to one another

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Frequently asked questions

Get answers to the most common queries related to the NEET UG Examination Preparation.

Where can you find fluid friction?

Ans. On the surface of a rushing river, lighter dust particles move quickly. This is because the top layer of water...Read full

What factors influence fluid friction?

Ans. Fluid friction, also known as viscosity, is an inherent feature of fluids, similar to the friction force betwe...Read full

What are some of the drawbacks of fluid friction?

Ans. The following are the main drawbacks of fluid friction: 1)It slows down the movement of things through fluids....Read full

What methods are used to reduce fluid friction?

Ans. A lubricant is a material that is put between two surfaces in contact to minimise friction. Fluid friction can...Read full

What is the definition of fluid liquid?

Ans. A fluid is a substance that, unlike a solid, cannot withstand a shear force or stress without moving. It’...Read full

Ans. On the surface of a rushing river, lighter dust particles move quickly. This is because the top layer of water has a strong velocity gradient due to reduced dynamic fluid friction.

 

Ans. Fluid friction, also known as viscosity, is an inherent feature of fluids, similar to the friction force between two rough surfaces. As a result, fluid friction is determined by all three factors: the object’s speed and form, as well as the fluid’s composition.

 

Ans. The following are the main drawbacks of fluid friction: 1)It slows down the movement of things through fluids. It makes it more difficult to accelerate. 2)When objects move through fluids, some of their energy is expended in overcoming fluid friction. This reduces their productivity.

Ans. A lubricant is a material that is put between two surfaces in contact to minimise friction. Fluid friction can be reduced by giving moving objects in fluids appropriate forms.

 

Ans. A fluid is a substance that, unlike a solid, cannot withstand a shear force or stress without moving. It’s commonly divided into two categories: liquids and gases. Intermolecular forces hold a liquid together, allowing it to have volume but no definite structure.

 

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