Physics: Moments of Force Quiz
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Questions and Answers

What is the relationship between the moment of a force and the perpendicular distance from the point of measurement to the line of action of the force?

  • The moment decreases as the perpendicular distance increases.
  • The moment remains constant regardless of the perpendicular distance.
  • The moment varies directly with the magnitude of the force and the perpendicular distance. (correct)
  • The moment depends only on the magnitude of the force.

    • If the perpendicular distance from the point of measurement to the line of action of the force is halved, what happens to the moment of the force?

  • The moment is halved. (correct)
  • The moment remains unchanged.
  • The moment is doubled.
  • The moment becomes zero.

    • In the equation M = F × d, what does the variable d represent?

  • The angle between the force and the line of action.
  • The perpendicular distance from the measurement point to the line of action of the force. (correct)
  • The total distance along the line of action.
  • The magnitude of the force applied.

    • What is true about the direction of the moment of a force when calculated at a point O?

    <p>It is directed perpendicular to the plane containing the moment center and the moment arm.</p> Signup and view all the answers

    What happens to the moment of force if the force applied is increased while keeping the perpendicular distance constant?

    <p>The moment increases.</p> Signup and view all the answers

    What sign is conventionally assigned to an anticlockwise moment?

    <p>Positive (+)</p> Signup and view all the answers

    Which of the following correctly describes the effect of a clockwise moment on a body?

    <p>It rotates the body in the same direction as the clock's hands.</p> Signup and view all the answers

    In the context of horizontal forces, how is the moment of force represented for a force applied rightward?

    <p>It is represented as -Fd.</p> Signup and view all the answers

    If a problem uses a negative sign convention for moments, which of the following statements is true?

    <p>Counterclockwise moments are labeled as negative.</p> Signup and view all the answers

    What aspect is considered consistent in the application of sign conventions for moments?

    <p>The conventions must remain consistent throughout a single problem.</p> Signup and view all the answers

    Which statement accurately describes a clockwise moment?

    <p>It is a moment that causes rotation similar to the movement of clock hands.</p> Signup and view all the answers

    What is the primary characteristic of anti-clockwise moments?

    <p>They cause rotation against the direction of clock hands.</p> Signup and view all the answers

    In the context of moment direction, what is the significance of the right-hand rule?

    <p>It helps to visualize the direction of force resulting in rotation.</p> Signup and view all the answers

    How are clockwise and anti-clockwise moments classified based on rotation direction?

    <p>Clockwise is negative and anti-clockwise is positive.</p> Signup and view all the answers

    What is the SI unit of moment magnitude?

    <p>Newton-metre (N⋅m)</p> Signup and view all the answers

    Which of the following is true regarding the application of moments?

    <p>Moments can exert either clockwise or anti-clockwise effects depending on force direction.</p> Signup and view all the answers

    What relationship does the moment of a force have with the area of triangle AQB?

    <p>The moment of the force is twice the area of triangle AQB</p> Signup and view all the answers

    In the example of a door hinged to a wall, which scenario experiences a greater moment when a force is applied?

    <p>Pushing at a point further from the hinges</p> Signup and view all the answers

    Which formula correctly expresses the moment of a force given force and distance?

    <p>M = Fd</p> Signup and view all the answers

    What is the geometric meaning of the moment of a force?

    <p>It represents twice the area of a triangle formed by the force and a point</p> Signup and view all the answers

    Which equation represents the relationship between the moments when a body is in rotational equilibrium?

    <p>(F₂ × d₂) + (F₄ × d₄) = (F₁ × d₁) + (F₃ × d₃)</p> Signup and view all the answers

    Which of the following statements accurately describes the moments caused by forces?

    <p>Forces in rotational equilibrium have their clockwise moments equal to their anticlockwise moments.</p> Signup and view all the answers

    What is the resultant moment when the body is in rotational equilibrium as per the law of moments?

    <p>Equal to zero.</p> Signup and view all the answers

    If the moment of force F₁ is calculated as negative, what does that indicate about its direction?

    <p>It is creating a clockwise moment.</p> Signup and view all the answers

    In the verification of the law of moments, which force contributes purely to anticlockwise moments?

    <p>F₂ and F₄</p> Signup and view all the answers

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