Free-Body Diagram and Assumptions Quiz
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Questions and Answers

What does a free-body diagram show?

  • The temperature of the object
  • The known and unknown forces acting on an object (correct)
  • The position of the object in space
  • The speed of the object

    • In a free-body diagram, what are pulleys assumed to be?

  • Frictionless and weightless (correct)
  • Rough and weightless
  • Rough and heavy
  • Frictionless and heavy

    • What is the nature of the frictional force in a free-body diagram?

  • It is proportional to the weight of the object
  • It increases with speed of motion
  • It is opposite the direction of motion (correct)
  • It depends on the color of the surfaces in contact

    • What does the normal force represent in a free-body diagram?

    <p>The force that supports the surface where the object is resting or in contact with</p> Signup and view all the answers

    What two factors affect friction according to the text?

    <p>The nature of material and surface area in contact</p> Signup and view all the answers

    What does the surface always exert on an object in terms of force?

    <p>An upward force equal in magnitude to the downward force of its weight</p> Signup and view all the answers

    What is the formula used to calculate friction?

    <p>Ff = µFN</p> Signup and view all the answers

    Which type of friction keeps the object from moving or staying stationary?

    <p>Static friction</p> Signup and view all the answers

    What is the coefficient of kinetic friction symbolized by?

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

    How is the direction of the coefficient of kinetic friction (µk) in relation to the motion of the object?

    <p>Always opposite the motion</p> Signup and view all the answers

    What is the formula for calculating force of kinetic friction (Fk)?

    <p>Fk = µkFN</p> Signup and view all the answers

    What does static friction depend on?

    <p>Surface roughness</p> Signup and view all the answers

    What is the maximum value of static friction in the given sample problem?

    <p>$3N$</p> Signup and view all the answers

    In the sample problem, if a bed is being pulled horizontally by an 875 N force and µk = 0.605, what is the normal force between the bed and the floor?

    <p>$825N$</p> Signup and view all the answers

    When a grocery pushcart is being pushed with a normal force of 825 N, North, what is the friction between the pushcart and the floor if the coefficient of static friction (µs) is 1.0?

    <p>$1N$</p> Signup and view all the answers

    Frictional force is always acting along the direction of motion.

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

    Frictional force is directly proportional to the normal force.

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

    Sliding friction depends on the speed of motion.

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

    The nature of material and existing questions affect friction.

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

    The surface always exerts a downward force on the object.

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

    The coefficient of kinetic friction (µk) is constant for specific materials that are in contact with each other.

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

    The formula for calculating friction is Ff = µFN.

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

    The direction of the coefficient of static friction (µs) is always opposite the force that tries to move the object.

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

    In a free-body diagram, the maximum value of static friction can be calculated using the formula Fs ≤ µsFN.

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

    The coefficient of static friction (µs) depends on the nature of the surface, where a rough surface has a higher µs compared to a slippery surface.

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

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