Introduction to Potential Energy
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Questions and Answers

What is the emergent speed of the bullet after it passes through the plywood?

  • 63.2 m/s (correct)
  • 20 m/s
  • 200 m/s
  • 100 m/s

    • How much of the initial kinetic energy does the bullet retain after passing through the plywood?

  • 50%
  • 5%
  • 10% (correct)
  • 20%

    • What formula is used to calculate the work done as shown in Fig. 5.3(a)?

  • $W = \frac{1}{2}mv_f^2 - \frac{1}{2}mv_i^2$
  • $W = \int F(x) dx$ (correct)
  • $W = \sum F(x)∆x$
  • $W = Fd$

    • What is the final speed of the bullet if the bullet has a mass of 0.05 kg?

    <p>63.2 m/s</p> Signup and view all the answers

    What is the unit of power named after James Watt?

    <p>Horse-power</p> Signup and view all the answers

    How many watts are equivalent to 59 horse-power?

    <p>44000 W</p> Signup and view all the answers

    What is the energy consumption of a 100 watt bulb left on for 10 hours in kilowatt hours?

    <p>1 kWh</p> Signup and view all the answers

    What physical quantities do we try to discover in physics that do not change in a physical process?

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

    What term is used to describe the 'stored' energy possessed by a stretched bow-string or fault lines in the earth's crust?

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

    In the context of potential energy, what happens when a body releases its stored energy?

    <p>It converts to kinetic energy</p> Signup and view all the answers

    What results from the readjustment of fault lines in the earth's crust possessing a large amount of potential energy?

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

    What is the representation of the work done by the spring force in terms of the plot of Fs versus x for a compressed spring?

    <p>Negative area</p> Signup and view all the answers

    What is the work done by the frictional force when the force is -50 N and the displacement is 20 m?

    <p>-1000 J</p> Signup and view all the answers

    In the context of the work-energy theorem for a variable force, what does the shaded rectangle in Fig. 5.3(a) represent?

    <p>Work done by a varying force over a small displacement</p> Signup and view all the answers

    If a woman pushes a trunk with a force that linearly reduces from 100 N to 50 N over a distance of 10 m, what happens to the applied force?

    <p>Reduces linearly with distance</p> Signup and view all the answers

    In the work-energy theorem context, why is the area under the curve in Fig. 5.3 important when ∆x approaches zero?

    <p>It is exactly equal to the work done by the varying force</p> Signup and view all the answers

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