Class 9 Work and Energy Concepts Quiz
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Questions and Answers

What is the definition of work done on an object?

  • The force applied to the object divided by the time taken for the displacement
  • The product of the mass of the object and the acceleration applied to it
  • The product of the magnitude of the force acting on the body and the displacement in the direction of the force (correct)
  • The product of the magnitude of the force acting on the body and the distance traveled by the body

    • What is the SI unit of energy or work?

  • Newton
  • Joule (Nm) or Kgm2s−2 (correct)
  • Pascal
  • Watt

    • What does the force component $F \cos \theta$ represent?

  • The total work done on the body
  • The total force applied to the body
  • The force perpendicular to the direction of displacement
  • The component of force along the direction in which the body is displaced (correct)

    • Which quantity is defined as the ability to do work?

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

    What is the sum of kinetic energy and potential energy known as?

    <p>Mechanical energy</p> Signup and view all the answers

    What is the formula for work done on an object?

    <p>$W = F \cdot s$</p> Signup and view all the answers

    What is the SI unit of force?

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

    What is the angle between the force vector and displacement vector in the formula for work done?

    <p>$\theta$</p> Signup and view all the answers

    What is the SI unit of energy or work?

    <p>Joule (Nm)</p> Signup and view all the answers

    What is the sum of kinetic energy and potential energy?

    <p>Mechanical energy</p> Signup and view all the answers

    Study Notes

    Work and Energy

    • Work done on an object is defined as the product of the force applied to the object and the displacement of the object in the direction of the force.
    • The SI unit of energy or work is the Joule (J).

    Force and Displacement

    • The force component $F \cos \theta$ represents the component of the force acting in the direction of the displacement.
    • The angle between the force vector and displacement vector in the formula for work done is θ (theta).

    Energy

    • Energy is defined as the ability to do work.
    • The SI unit of energy or work is the Joule (J).
    • The sum of kinetic energy and potential energy is known as mechanical energy.

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    Description

    Test your understanding of work and energy concepts with this Class 9 quiz. Assess your knowledge of the definition of work, calculation of work done, and the relationship between force and displacement.

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