Physics: Center of Mass and Center of Gravity Multiple Choice Quiz
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Questions and Answers

If two forces exert equal non-zero torques, what can be said about the torques?

  • They are in opposite directions (correct)
  • They cancel each other out
  • They are in the same direction
  • They add up to zero
  • In the scenario of two forces applied perpendicularly to a doorknob, if the first force is twice as large as the second force, what is the torque ratio?

  • 1/3
  • 1/2
  • 2 (correct)
  • 3
  • In problem-solving with a uniform seesaw, if Child A has a mass of 60 kg and sits 2.0 m from the center, and Child B has a mass of 40 kg, what is the condition for balancing the seesaw?

  • Child B must sit closer to the center than Child A
  • Child B must sit 3.0 m from the center (correct)
  • Child B must sit 1.0 m from the center
  • Child B must sit further from the center than Child A
  • When a 10.0-m uniform beam of weight 100 N is supported by two ropes at the ends, and a 400-N person sits at 2.00 m from the left end of the beam, what is the tension in the left rope?

    <p>370 N</p> Signup and view all the answers

    If two children sit on opposite ends of a seesaw with masses of 60 kg and 40 kg respectively, how does their distance from the center affect balancing?

    <p>The heavier child must sit closer to the center</p> Signup and view all the answers

    Which statement about the center of mass of an object is FALSE?

    <p>For an object on Earth, the center of gravity and center of mass are always the same point.</p> Signup and view all the answers

    A 4.00-kg mass is located at the origin, and a 10.0-kg mass is located at x = +21.0 m. Where is the center of mass on the x-axis?

    <p>+14.0 m</p> Signup and view all the answers

    In a two-particle system with the center of mass at the origin, one particle has a mass of 2.0 kg and is located at (3.0 m, 0). What is the location of the second particle with a mass of 3.0 kg?

    <p>(-3.0 m, 0)</p> Signup and view all the answers

    Two equal forces are applied to a door, one at the midpoint and one at the doorknob, both perpendicular to the door. Which force exerts the greater torque?

    <p>the force at the doorknob</p> Signup and view all the answers

    Two equal forces are applied to a door at the doorknob, one perpendicular to the door and one at 30 degrees to the plane of the door. Which force exerts the greater torque?

    <p>the force applied perpendicular to the door</p> Signup and view all the answers

    What is the relationship between the center of mass and center of gravity for an object on the surface of the Earth?

    <p>They are always the same point.</p> Signup and view all the answers

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