Fluid Mechanics and Archimedes Principle
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Questions and Answers

What happens to an object when the upthrust is greater than its weight?

  • The object sinks.
  • The object displaces the fluid.
  • The object floats. (correct)
  • The object remains suspended.

    • A mug filled with water feels heavier when submerged underwater.

    False

    What is the net upward force on an object in a fluid called?

    buoyant force or upthrust

    If upthrust equals the object's weight, the object will remain __________ at a particular depth.

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

    Match the following outcomes with their corresponding conditions:

    <p>Floats = Upthrust &gt; weight Sinks = Upthrust &lt; weight Suspended = Upthrust = weight</p> Signup and view all the answers

    What is the value of upthrust acting on a submerged wooden block with side length 10 cm?

    <p>9.8 N</p> Signup and view all the answers

    The density of water is 1000 g/m³.

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

    What principle is used to calculate the upthrust on a submerged object?

    <p>Archimedes' principle</p> Signup and view all the answers

    The volume of a cubic block of side length 10 cm is __________.

    <p>0.001 m³</p> Signup and view all the answers

    Match the following values to their units:

    <p>Density of water = kg/m³ Gravitational acceleration = m/s² Weight in air = N Volume of wood block = m³</p> Signup and view all the answers

    What is the principle that describes the up-thrust acting on an object immersed in a liquid?

    <p>Archimedes' Principle</p> Signup and view all the answers

    The up-thrust on a submerged object can be less than the weight of the liquid it displaces.

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

    What is the formula for calculating the up-thrust acting on a cylinder immersed in a liquid?

    <p>F = ho g A h</p> Signup and view all the answers

    The up-thrust acting on the cylinder is equal to the weight of the liquid __________ by the cylinder.

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

    Match the following applications with their descriptions:

    <p>Ships = Made less dense than the volume of water they occupy Submarines = Can travel both above and below water Archimedes' Principle = Describes the relationship between up-thrust and liquid weight displaced Buoyancy Chambers = Used in ships to enhance buoyancy</p> Signup and view all the answers

    In the equation $F = ho g A h$, what does the symbol $h$ represent?

    <p>Height of the cylinder immersed</p> Signup and view all the answers

    Submarines float when the weight of water equal to their volume is less than their weight.

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

    The formula for pressure at a depth $h$ is given by $P = ho g h$, where $ ho$ is the __________ of the liquid.

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

    Study Notes

    Fluid Mechanics

    • Fluids include liquids and gases
    • Fluid mechanics studies the behaviour of fluids
    • Static fluids involve the pressure exerted by fluids
    • Flowing fluids involve how fluids move and change depending on factors, like velocity or external forces
    • The study of flowing fluids is called fluid dynamics
    • Fluid dynamics is complex and often involves compressing assumptions such as steady flow, conservation of mass and energy
    • Basic equations for fluid mechanics include the continuity equation and Bernoulli's equation

    Upthrust and Archimedes Principle

    • Upthrust is the upward force on an object submerged in a fluid.
    • Archimedes' principle states that the upthrust is equal to the weight of the fluid displaced by the object.
    • An object will float when the upthrust is greater than or equal to the weight of the object.
    • The following factors contribute toward whether an object floats, sinks, or remains suspended:
      • upthrust
      • weight of the object

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    Description

    Explore the fundamentals of fluid mechanics, including the behavior of fluids, static and dynamic conditions. Dive into key concepts such as upthrust and Archimedes' Principle to understand how objects float or sink in fluids.

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