Gravitational Potential Energy
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Questions and Answers

What is the unit of measurement for the amount of energy in the kinetic energy store?

  • Joule (J) (correct)
  • Watt (W)
  • Newton (N)
  • Kilowatt (kW)

    • What happens to the kinetic energy store of an object when it slows down?

  • It increases
  • It remains the same
  • It empties (correct)
  • It is filled

    • What is the formula to calculate the amount of energy in the kinetic energy store?

  • Ek = 0.5 x m x v
  • Ek = 0.5 x m x v² (correct)
  • Ek = m x v³
  • Ek = m x v

    • What type of energy transfer occurs when a force is applied to move an object over a distance?

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

    What happens to the chemical store of an object during a chemical reaction?

    <p>It is emptied</p> Signup and view all the answers

    What type of energy transfer occurs when there is a difference in temperatures?

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

    What is the power rating of an appliance used to calculate?

    <p>The rate of energy transferred</p> Signup and view all the answers

    What happens to the kinetic energy store of an object as its velocity increases?

    <p>It increases</p> Signup and view all the answers

    What is a fundamental concept about energy?

    <p>Energy can be transferred between stores</p> Signup and view all the answers

    What happens to the gravitational potential energy of an object as it is lifted?

    <p>It increases</p> Signup and view all the answers

    What is the unit of measurement for energy in the gravitational potential energy store?

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

    What is the value of the gravitational field strength on Earth?

    <p>9.8 N/kg</p> Signup and view all the answers

    What is the equation to calculate the energy in the gravitational potential energy store?

    <p>Ep = m x g x h</p> Signup and view all the answers

    What is the relationship between the speed of an object and the energy in its kinetic energy store?

    <p>The faster the object, the more energy in its kinetic energy store</p> Signup and view all the answers

    What is the difference between speed and velocity?

    <p>Speed is a scalar, velocity is a vector</p> Signup and view all the answers

    What is the correct calculation for the increase in energy in the gravitational potential energy store of the 80 kg diver?

    <p>Ep = 80 kg x 9.8 N/kg x 10 m = 7840 J</p> Signup and view all the answers

    Study Notes

    Energy Storage and Transfer

    • Energy is conserved and cannot be created or destroyed, only transferred between stores.
    • The total energy remains the same before and after any changes.

    Gravitational Potential Energy Store

    • As an object is lifted, work is done against the force of gravity, and energy is stored in the gravitational potential energy store.
    • The higher the object, the more energy is stored in the gravitational potential energy store.
    • Energy in the gravitational potential energy store (Ep) = mass (m) x gravitational field strength (g) x height (h).
    • The unit of measurement for energy in the gravitational potential energy store is the joule (J).
    • On Earth, the gravitational field strength (g) is 9.8 N/kg.

    Kinetic Energy Store

    • The faster an object is traveling, the more energy there is in the kinetic energy store.
    • Speed is measured in m/s, and velocity is speed in a particular direction.
    • Energy in the kinetic energy store (Ek) = 0.5 x mass (m) x velocity² (v²).
    • The unit of measurement for the amount of energy in the kinetic energy store is the joule (J).
    • The kinetic energy store of an object increases as its velocity and mass increase.

    Energy Transfer

    • Energy can be transferred between stores through mechanical work, electrical work, heating, and radiation.
    • In the home, energy can be transferred by:
      • Mechanical work – when a force is applied to move an object over a distance.
      • Electrical work – when charge flows (electricity).
      • Heating – when there is a difference in temperatures.
      • Radiation – when energy is transferred as a wave, for example as light or sound.

    Energy in the Home

    • Appliances can transfer energy from one store to another, such as a washing machine that transfers energy from electrical work to the kinetic energy store of the motor.
    • The power rating of an appliance can be used to calculate the amount of energy transferred while it is being used.
    • A power rating of 100 watts means that 100 joules of energy are transferred each second.

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    Description

    This quiz covers the concept of energy storage and transfer, specifically focusing on gravitational potential energy and how it relates to the force of gravity and work done.

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