Principles of Mechanical Devices
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Questions and Answers

What is the definition of mass?

  • The amount of space occupied by an object
  • The force of gravity acting on an object
  • The velocity of an object
  • The amount of matter in an object (correct)

    • What is the force of gravity described by?

  • Fg = m1 + m2
  • Fg = m1 - m2
  • Fg = Gm1m2 / r^2 (correct)
  • Fg = r / m1m2

    • What type of force is friction?

  • A force that opposes motion (correct)
  • A pushing force
  • A force that aids motion
  • An attractive force

    • What is compression?

    <p>A force that squeezes an object</p> Signup and view all the answers

    What is the characteristic of forces?

    <p>They have both magnitude and direction</p> Signup and view all the answers

    What is the result of the sum of forces acting on an object with no acceleration?

    <p>The forces sum to zero</p> Signup and view all the answers

    What is the nature of the force of gravity?

    <p>It is always attractive</p> Signup and view all the answers

    What can be found by summing the potential energy, kinetic energy, and work done by friction?

    <p>The total energy in the system</p> Signup and view all the answers

    What is the unit of measurement used to quantify tension?

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

    According to Newton's First Law of Motion, an object in motion will stay in motion unless acted on by what?

    <p>An outside force</p> Signup and view all the answers

    What is the relationship between acceleration and mass according to Newton's Second Law of Motion?

    <p>Acceleration is inversely proportional to mass</p> Signup and view all the answers

    What is the underlying reason for a greater atmospheric pressure at Earth's surface?

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

    What is the result of the attractive force of gravity acting on air molecules?

    <p>An increase in atmospheric density</p> Signup and view all the answers

    What is the term used to describe the tendency of an object to resist a change in motion?

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

    What is the relationship between force and acceleration according to Newton's Second Law of Motion?

    <p>Force is directly proportional to acceleration</p> Signup and view all the answers

    What is an example of Newton's Third Law of Motion?

    <p>You pushing on a wall, and the wall pushing against you</p> Signup and view all the answers

    Study Notes

    Principles of Mechanical Devices

    • The ASVAB test section covers mechanical advantage, simple machines, compound machines, structural support, and properties of materials.

    Mass

    • Mass is the amount of matter in an object, independent of gravity.
    • Matter is anything that has mass and takes up space.

    Force

    • Forces are interactions between two or more objects, possessing magnitude and direction.
    • Forces can be thought of as "pushes" or "pulls" (e.g., attraction, repulsion, gravity, electric force).
    • When an object experiences no acceleration (constant velocity), the sum of forces acting on it is zero.

    Gravity

    • Gravity is the force of attraction between two masses.
    • Gravity is described by the equation: Fg = G * m1 * m2 / r^2.
    • Gravity is only attractive and the reason objects fall towards the ground.

    Friction

    • Friction is the force opposing an object in motion, always opposite to the direction of motion.
    • Friction arises from microscopic interactions between surfaces.
    • In a system involving friction, total energy is found by summing potential energy, kinetic energy, and work done by friction.

    Compression and Tension

    • Compression is a force applied inward, squeezing an object.
    • Tension is a force exerted when pulling, typically measured in pounds or Newtons.

    Newton's Laws of Motion

    First Law

    • An object at rest will stay at rest, and an object in motion will stay in motion unless acted on by an outside force.
    • This law is also referred to as the law of inertia.

    Second Law

    • The acceleration of an object is directly proportional to the force exerted, and inversely proportional to its mass.

    Third Law

    • For every action, there's an equal and opposite reaction.

    Fluid Dynamics

    • Questions typically relate to air pressure, water pressure, and filling/emptying tanks.

    Air Pressure

    • Air pressure is the weight of the atmosphere surrounding Earth, caused by the attractive force of gravity.
    • Atmospheric pressure is greater at Earth's surface due to increased atmospheric density.

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    Description

    Quiz on mechanical advantage, simple machines, compound machines, structural support, and properties of materials from the ASVAB test.

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