Physics: Kinetic Energy and Gravitational Potential Energy
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Questions and Answers

What is the maximum gravitational potential energy in the given scenario?

  • 1.962 J
  • 0.4905 J (correct)
  • 0.25 J
  • 9.81 J

    • What is the density of a material?

  • Extension per unit force
  • Mass per unit area
  • Force per unit area
  • Mass per unit volume (correct)

    • What does Hooke's law state?

  • Extension is directly proportional to the force applied (correct)
  • Extension is proportional to the cube of the force applied
  • Extension is proportional to the square of the force applied
  • Extension is inversely proportional to the force applied

    • What happens to the material when the force applied is beyond the elastic limit?

    <p>It deforms plastically</p> Signup and view all the answers

    What is the formula for Hooke's law?

    <p>F = kΔL</p> Signup and view all the answers

    What is tensile strain?

    <p>Extension over the original length</p> Signup and view all the answers

    What happens to the energy when a material is stretched elastically?

    <p>It is stored as elastic strain energy</p> Signup and view all the answers

    What is the purpose of crumple zones in cars?

    <p>To decrease the car's kinetic energy by doing work to deform plastically</p> Signup and view all the answers

    What can be inferred from the shape of a stress-strain graph?

    <p>The material's ductility</p> Signup and view all the answers

    What is the main difference between a force-extension graph and a stress-strain graph?

    <p>The object being described</p> Signup and view all the answers

    What happens to the energy when a spring is stretched and then released?

    <p>It is converted into kinetic energy</p> Signup and view all the answers

    What is the ultimate tensile stress (UTS) on a stress-strain graph?

    <p>The highest point on the graph, showing the maximum stress the material can withstand</p> Signup and view all the answers

    What is the total energy in a system equal to?

    <p>Total energy out</p> Signup and view all the answers

    What type of energy is transferred to when a ball is thrown up into the air?

    <p>Gravitational potential energy</p> Signup and view all the answers

    What is the reason why the initial kinetic energy given to the ball is not equal to the maximum gravitational potential energy when the ball has stopped in mid-air?

    <p>Work is being done by the ball to work against resistive forces</p> Signup and view all the answers

    What is the formula to calculate the change in gravitational potential energy?

    <p>ΔEp = mgΔh</p> Signup and view all the answers

    What is the energy converted to when the ball falls back to the ground?

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

    Why is the effect of air resistance ignored in the example question?

    <p>To simplify the problem</p> Signup and view all the answers

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