Introduction to Fluid Mechanics

Questions and Answers

What is the primary focus of fluid mechanics?

The classification of fluid types based on color

The behavior of fluids at absolute zero

The study of solid materials under stress

The relationships between forces and motions in fluids (correct)

Which characteristic defines a substance as a fluid?

It has a definite shape and volume

It has a high shear modulus

It can resist shear forces applied to it

It undergoes continuous deformation (correct)

What is a feature of steady fluids?

Their density changes constantly

Their density remains constant at every point (correct)

Their velocity varies between points

They cannot be compressible

How are compressible fluids classified?

By Mach number Signup and view all the answers

Which of the following is NOT a classification of fluids based on flow?

Solid or liquid Signup and view all the answers

What distinguishes unsteady fluids from steady fluids?

Unsteady fluids have a velocity that varies between points Signup and view all the answers

Which statement about fluids is accurate?

Fluids can be either liquids or gases Signup and view all the answers

Study Notes

Fluid Mechanics Overview

Studies fluids in both static and dynamic situations.
A branch of continuous mechanics involving forces, motions, and statics in continuous materials.

Definition of Fluid

Fluids continuously deform and flow when subjected to external pressure.
Lack a definite shape and cannot withstand shear forces at rest.
Possess zero shear modulus, meaning they yield to applied shear forces.

Classification of Fluids by Flow

Steady vs. Unsteady
- Steady fluids maintain constant density at all points while flowing.
- Unsteady fluids exhibit varying velocities between points during flow.
Compressible vs. Incompressible
- Classification based on Mach number, a dimensionless ratio of flow velocity to the speed of sound in the fluid.
- Incompressible fluids typically have a Mach number less than 0.3, allowing density to remain constant with changes in pressure.
Viscous vs. Non-viscous
- Viscous fluids exhibit resistance to flow due to internal friction.
- Non-viscous fluids lack internal friction and flow freely.
Rotational vs. Irrotational
- Rotational fluids involve rotation of fluid particles around their axis.
- Irrotational fluids have no net rotation of fluid particles, simplifying analysis.

Description

This quiz covers the fundamental concepts of fluid mechanics, focusing on the behavior of fluids in both static and dynamic situations. Delve into the characteristics of fluids and their responses to forces and pressures. Test your knowledge on the definitions and principles governing fluid behavior.