Statics and Biomechanics Quiz
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Questions and Answers

In static (rotational) equilibrium, what condition must be satisfied?

  • The system is stationary
  • Net force on the rigid body is zero
  • The rigid body is at rest
  • Net torque on the rigid body is zero (correct)

    • What does dynamic (translational) equilibrium imply?

  • The rigid body is in rotational equilibrium
  • The system is not at rest
  • The net force on the rigid body is zero (correct)
  • The system is travelling at constant velocity

    • What physical quantity causes an object to begin rotating or moving in a circle?

  • Torque (correct)
  • Force
  • Weight
  • Mass

    • What is the equation for torque?

    <p>$\tau = dF\sin\theta$</p> Signup and view all the answers

    What does a net torque of zero indicate about a rigid body?

    <p>The rigid body is in static (rotational) equilibrium</p> Signup and view all the answers

    When is a seesaw perfectly balanced?

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

    What factor does torque depend on?

    <p>Force, distance, and angle</p> Signup and view all the answers

    In dynamic equilibrium, what is the condition for the rigid body?

    <p>Experiencing no translational acceleration</p> Signup and view all the answers

    What does a net force of zero indicate about a rigid body?

    <p>The rigid body is in dynamic (translational) equilibrium</p> Signup and view all the answers

    What is the point of rotation in a lever known as?

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

    In a first class lever, when is the mechanical advantage (MA) greater than 1?

    <p>When the force arm is longer than the load arm</p> Signup and view all the answers

    Which type of lever is commonly found in the human body, producing speed and range of motion movements?

    <p>Third class lever</p> Signup and view all the answers

    What serves as the fulcrum in the human body's lever system?

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

    What movement is produced by a third class lever in the human body?

    <p>Speed and range of motion</p> Signup and view all the answers

    In a second class lever, where is the load positioned in relation to the fulcrum and the force?

    <p>Between the fulcrum and the force</p> Signup and view all the answers

    What is the ratio used to calculate mechanical advantage (MA) in a lever?

    <p>Force arm / Load arm</p> Signup and view all the answers

    In a third class lever, where is the force positioned in relation to the fulcrum and the load?

    <p>Between the fulcrum and the load</p> Signup and view all the answers

    What is the function of the bones in the human body's lever system?

    <p>To serve as levers</p> Signup and view all the answers

    When is the mechanical advantage (MA) equal to 1 in a lever system?

    <p>When the force arm is equal to the load arm</p> Signup and view all the answers

    What is the characteristic feature of a second class lever?

    <p>The load is between the fulcrum and the force</p> Signup and view all the answers

    What does a positive torque indicate when using the right hand rule for counterclockwise rotation?

    <p>The rotation is counterclockwise and the torque is positive</p> Signup and view all the answers

    Where is the center of mass or center of gravity of a symmetric object located?

    <p>At the geometrical center</p> Signup and view all the answers

    How can the center of mass of an irregular-shaped object be determined?

    <p>By drawing vertical lines from different suspension points and finding their intersection</p> Signup and view all the answers

    In what position does a system experience static stable equilibrium?

    <p>There is a vertical line that passes both the object’s center of gravity and its base of support</p> Signup and view all the answers

    What is a lever?

    <p>A device that applies force or transfers it</p> Signup and view all the answers

    What does a negative torque indicate when using the right hand rule for clockwise rotation?

    <p>The rotation is clockwise and the torque is negative</p> Signup and view all the answers

    Where can the whole mass of a body be considered to be concentrated?

    <p>At the center of mass or center of gravity</p> Signup and view all the answers

    What does the intersection of drawn lines from different suspension points indicate for an irregular-shaped object?

    <p>The center of mass</p> Signup and view all the answers

    What does a system experience if it returns to equilibrium after being small displaced?

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

    What is the condition for a system to be in static stable equilibrium?

    <p>There is a vertical line that passes both the object’s center of gravity and its base of support</p> Signup and view all the answers

    What type of device is a lever?

    <p>A force-applying or force-transferring device</p> Signup and view all the answers

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