Work and Energy Introduction Quiz
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Questions and Answers

What is the mathematical expression for the work done by a force F on a body displaced through a displacement s?

  • $W = F/s$
  • $W = F - s$
  • $W = F \cdot s$ (correct)
  • $W = Fs$
  • What is the SI unit of work?

  • Erg
  • Newton
  • Dyne
  • Joule (correct)
  • In which direction does positive work occur?

  • In the same direction as the force (correct)
  • In the opposite direction of the force
  • Perpendicular to the force
  • At an angle of 45 degrees to the force
  • What are the dimensions of work in terms of mass (M), length (L), and time (T)?

    <p>[ML²T–2]</p> Signup and view all the answers

    What is the equivalent of 1 kilowatt-hour (kWh) in joules?

    <p>$3.6 \times 10^6$ joules</p> Signup and view all the answers

    In which situation is the work done by gravity positive?

    <p>When a body falls freely under the action of gravity</p> Signup and view all the answers

    When does zero work occur?

    <p>When pushing a wall and it remains at rest</p> Signup and view all the answers

    In which scenario is the work done by frictional force negative?

    <p>When work done by braking force on the car occurs</p> Signup and view all the answers

    What is the work done by a force F⃗ = (2ı̂ + 3ȷ̂ +k)N on a displacement s⃗ = (ı̂ + 4ȷ̂ + k)m?

    <p>-15 J</p> Signup and view all the answers

    If a force F⃗ = ( ı̂ + 2ȷ̂ − 15k ) N displaces a particle from origin to point P(α, α, 1), for which values of α are force and displacement orthogonal to each other?

    <p>-3, -3</p> Signup and view all the answers

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