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Does fluid friction vary with speed?

   Does fluid friction vary with speed?

Conceptual Physics

Conceptual Physics

Paul G. Hewitt 12th Edition

Chapter 4, Problem 7

Instant Answer

Solved by Expert Jerrah Biggerstaff

04/29/2021

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Fluid friction is the force that restricts the movement of an object through a liquid or within the liquid itself. This can be due to the movement of the molecules inside the fluid (internal friction) or how the fluid interacts with other matter (external Show more…

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Key Concepts

Fluid Friction

Fluid friction refers to the resistance encountered by an object moving through a fluid, or by different layers of the fluid moving relative to each other, due to the internal friction of the fluid. It arises because of the fluid’s viscosity and is a key factor in determining how much energy is lost as heat when an object moves within the fluid medium.

Viscosity

Viscosity is an intrinsic property of a fluid that characterizes its resistance to flow and deformation. A higher viscosity indicates a 'thicker' fluid that resists motion more strongly, leading to greater fluid friction, whereas a lower viscosity indicates a 'thinner' fluid with lower fluid friction. The interaction between the fluid’s viscosity and the speed of motion greatly influences the magnitude of frictional forces.

Drag Force

Drag force is the force exerted by a fluid opposing the motion of an object through it, and it is one manifestation of fluid friction. The magnitude of the drag force often varies with the speed of the object due to factors intrinsic to the flow, such as changes in the flow regime. In many cases, particularly at higher speeds or in turbulent flows, the drag force can depend on the square of the velocity.

Reynolds Number

The Reynolds number is a dimensionless number used in fluid dynamics to predict flow patterns in different fluid flow situations. It combines factors like fluid speed, characteristic length, and viscosity to indicate whether the flow will be laminar or turbulent. Variations in Reynolds number with increasing speed can lead to different frictional characteristics, affecting how fluid friction behaves under different flow conditions.

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