Concurrent Force System and Muscle Movements Quiz
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Questions and Answers

What is the process called when a single force is decomposed into two perpendicular components?

  • Vector resolution (correct)
  • Force decomposition
  • Magnitude analysis
  • Directional division
  • Which of the following is NOT one of the four characteristics of a force vector?

  • Velocity (correct)
  • Direction
  • Magnitude
  • Point of application
  • Which type of internal force is generated by stimulated muscle, often under volitional control?

  • Passive force
  • Ground reaction force
  • Active force (correct)
  • Gravitational force
  • How do changes in joint angle affect the active force-generating capacity of two-joint muscles?

    <p>Active force is maximized at an intermediate joint angle</p> Signup and view all the answers

    Which of the following is an example of an external force acting on the body?

    <p>Gravitational force</p> Signup and view all the answers

    What is the term used to describe the phenomenon where a muscle's active force-generating capacity is reduced at shorter muscle lengths due to the overlap of the actin and myosin filaments?

    <p>Active insufficiency</p> Signup and view all the answers

    What is the primary purpose of the loose-packed positions of the major joints in the lower extremity?

    <p>To facilitate movement during extended bed rest</p> Signup and view all the answers

    Which of the following is a correct definition of kinetics?

    <p>The study of the effect of forces on the body</p> Signup and view all the answers

    What is the formula for calculating the quantity of a force?

    <p>F = m * a</p> Signup and view all the answers

    What is the standard international unit of force?

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

    How are two or more collinear forces combined?

    <p>By adding the forces together</p> Signup and view all the answers

    What is the result when two forces are concurrent (make an angle with each other)?

    <p>The resultant force is obtained by the cosine law</p> Signup and view all the answers

    What do the sternal (S) and clavicular (C) portions of the pectoralis major muscle form?

    <p>A concurrent force system</p> Signup and view all the answers

    What movement can the combined action of the anterior (A) and posterior (P) parts of the deltoid muscle produce?

    <p>Flexion or extension in the sagittal plane</p> Signup and view all the answers

    When both heads of the gastrocnemius muscle pull in lateral (L) and medial (M) directions together, what force is exerted on the Achilles tendon?

    <p>Upward force</p> Signup and view all the answers

    How can the resultant force of concurrent forces be determined when there are more than two forces?

    <p>Graphical method drawing a polygon</p> Signup and view all the answers

    What is the product of a force and its moment arm that produces a torque or moment?

    <p>$F \times L$</p> Signup and view all the answers

    In terms of joint mechanics, what is torque considered as?

    <p>A rotatory equivalent to a force</p> Signup and view all the answers

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