Fluid Dynamics Quiz
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Questions and Answers

What is the full name of the international system of units?

Syst'eme International

Which of the following is NOT a base quantity in the SI system?

  • Time
  • Density (correct)
  • Length
  • Mass

    • Match the following SI base quantities with their corresponding base units:

    Length = meter Mass = kilogram Time = second Electric Current = ampere Thermodynamic Temperature = kelvin Amount of Substance = mole Luminous Intensity = candela

    What is the SI unit for volume?

    <p>cubic meter</p> Signup and view all the answers

    What is the symbol for radian?

    <p>rad</p> Signup and view all the answers

    Scientific notation is a way to write very large numbers and very small numbers using decimals.

    <p>False (B)</p> Signup and view all the answers

    What is the prefix for the term 10^12?

    <p>Tera</p> Signup and view all the answers

    What is the symbol for the prefix 'micro'?

    <p>µ</p> Signup and view all the answers

    A light year is a unit of distance.

    <p>True (A)</p> Signup and view all the answers

    What is the symbol for the unit 'angstrom'?

    <p>Å</p> Signup and view all the answers

    What is the symbol for the unit 'micron'?

    <p>µ</p> Signup and view all the answers

    Unit symbols are always printed in italic.

    <p>False (B)</p> Signup and view all the answers

    It is not accurate to use abbreviations for unit names, such as 'sec' for 'second' or 'sq.mm' for 'square millimeter'.

    <p>True (A)</p> Signup and view all the answers

    What is the term for the doubt or uncertainty associated with a measurement?

    <p>error</p> Signup and view all the answers

    Which type of error tends to be in a single direction (either positive or negative)?

    <p>Systematic Error (A)</p> Signup and view all the answers

    The smallest value that can be measured by a specific measuring instrument is called its 'least count'.

    <p>True (A)</p> Signup and view all the answers

    What is the term for the quantification or magnitude of error or doubt in measurement?

    <p>uncertainty</p> Signup and view all the answers

    Which of the following is NOT a way to reduce uncertainty in measurement?

    <p>Ignoring any potential sources of errors (C)</p> Signup and view all the answers

    What is the term for the process by which a vector is split into two perpendicular components?

    <p>resolving</p> Signup and view all the answers

    What is the name of the mathematical theorem used to calculate the sum of two perpendicular vectors?

    <p>Pythagoras's theorem</p> Signup and view all the answers

    The parallelogram rule and the triangle rule can only be used for collinear or coplanar vectors.

    <p>True (A)</p> Signup and view all the answers

    The order in which vectors are added in vector addition does not impact the resultant vector.

    <p>True (A)</p> Signup and view all the answers

    What is the term for the state of an object when the net force acting on it is zero?

    <p>equilibrium</p> Signup and view all the answers

    Concurrent forces always act through a common point.

    <p>True (A)</p> Signup and view all the answers

    The first condition of equilibrium states that the sum of all forces acting on a body must be zero.

    <p>True (A)</p> Signup and view all the answers

    What is the term for the turning effect of a force?

    <p>moment</p> Signup and view all the answers

    Coplanar forces act in the same plane, but not necessarily through the same point.

    <p>True (A)</p> Signup and view all the answers

    What is the equation used to calculate the moment of a force about a point?

    <p>tau = r x F</p> Signup and view all the answers

    The sign (positive or negative) of a moment depends on the direction of the force and the displacement from the pivot point.

    <p>True (A)</p> Signup and view all the answers

    What is the term for the constant maximum velocity attained by an object falling through a resistive medium?

    <p>terminal velocity</p> Signup and view all the answers

    The coefficient of viscosity is a measure of the resistance to flow of a fluid.

    <p>True (A)</p> Signup and view all the answers

    What is the SI unit for viscosity?

    <p>Pascal-second (Pa s)</p> Signup and view all the answers

    Stokes's Law is a mathematical formula describing the viscous drag force on a spherical object moving through a fluid.

    <p>True (A)</p> Signup and view all the answers

    The equation of continuity states that the mass of an ideal fluid remains constant as it flows through a pipe.

    <p>True (A)</p> Signup and view all the answers

    Bernoulli's equation describes the conservation of energy in a fluid flow, relating pressure, speed, and height.

    <p>True (A)</p> Signup and view all the answers

    Flashcards

    System of Units

    A complete set of units for all physical quantities.

    Physical Quantities

    Quantities that can be measured and expressed numerically.

    Base Quantities

    Quantities that are used to define all other quantities.

    Base Units

    Units for base quantities.

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    Derived Quantities

    Quantities expressed in terms of base quantities.

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    Derived Units

    Units for derived quantities.

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    SI (Systeme International)

    The accepted system of units for the whole world.

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    Radian (rad)

    The angle subtended at the center of a circle by an arc with a length equal to the radius of the circle.

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    Steradian (sr)

    The solid angle subtended at the center of a sphere by an area of its surface equal to the square of the radius.

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    Scientific Notation

    Expressing very large or very small numbers concisely.

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    Precision

    The closeness of measurements to each other.

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    Accuracy

    The closeness of measurements to the actual value of the quantity.

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    Significant Figures

    Digits of a number that are considered reliable.

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    Error

    The difference between the measured value and the true value of the quantity.

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    Systematic Errors

    Errors that tend to be in one direction, either positive or negative.

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    Random Errors

    Errors that occur irregularly and are unpredictable.

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    Least Count

    The smallest value that can be measured by a measuring instrument.

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    Least Count Error

    The error associated with the resolution of the measuring instrument.

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    Uncertainty

    Quantification of the doubt in a measurement.

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    Absolute Uncertainty

    Uncertainty with the same unit as the quantity. Denoted by Delta.

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    Relative Uncertainty

    Uncertainty without units. Denoted by epsilon.

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    Addition of Uncertainties: Sum or Difference

    Absolute uncertainties are added.

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    Addition of Uncertainties: Product or Quotient

    Fractional uncertainties are converted into percentage uncertainties, which are then added.

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    Addition of Uncertainties: Power

    The percentage uncertainty is multiplied by the power, and then converted back to fractional uncertainty.

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    Dimensions

    Used to describe the physical nature of a quantity.

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    Dimensional Formula

    Shows how and which base quantities represent the dimensions of a physical quantity.

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    Dimensional Equation

    Equates a physical quantity with its dimensional formula.

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    Dimensional Constants

    Have dimensions and are constant.

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    Dimensional Variables

    Have dimensions and are variable.

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    Dimensionless Constants

    No dimensions and are constant.

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    Dimensionless Variables

    No dimensions and are variable.

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    Study Notes

    Fluid Dynamics

    • A fluid is a substance that can flow.
    • Its shape is governed by the shape of its container.
    • Viscosity is the resistance to flow of a fluid.
      • Higher viscosity, higher resistance to flow.
    • Drag force - retarding force experienced by an object moving through a fluid.
    • Terminal velocity - maximum velocity reached by an object falling through a fluid.
    • Streamline flow - fluid flows along identical paths.
    • Turbulent flow - fluid flows with irregular, whirlpool-like regions.
    • Equation of Continuity - volume flow rate is constant in a pipe of varying cross-section.
    • Bernoulli's Equation - a balance of kinetic energy, pressure, and gravitational potential energy. P + ½pv² + pgh = constant
      • P is pressure, p is density, v is velocity, g is acceleration due to gravity, and h is height.

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    Physics Lectures PDF

    Description

    Test your knowledge on the principles of fluid dynamics. Explore key concepts such as viscosity, drag force, and the equations governing fluid flow, including Bernoulli's Equation and the Equation of Continuity. Perfect for students looking to reinforce their understanding of fluid behavior.

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