Mechanical Energy and Heat Quiz
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Questions and Answers

When a block slides on a rough surface, why does it become warm?

  • Due to the decrease in friction
  • Due to the increase in mechanical energy and decrease in internal energy
  • Due to the loss of mechanical energy and increase in internal energy (correct)
  • Due to the transfer of mechanical energy to the surroundings

    • What happens when a hot body is kept in contact with a cold body?

  • The hot body absorbs more heat from the cold body
  • Both bodies maintain their temperatures
  • The cold body warms up and the hot body cools down (correct)
  • The cold body absorbs energy from the surroundings

    • What happens when two vehicles collide during an accident?

  • They become very hot due to the loss of mechanical energy (correct)
  • They absorb mechanical energy from the surroundings
  • Friction between them decreases their temperature
  • They remain at their initial temperature

    • Why does an aeroplane catch fire when it crashes?

    <p>It becomes so hot due to the loss of mechanical energy</p> Signup and view all the answers

    What happens to the internal energy of a hot body when it is placed in contact with a cold body?

    <p>The internal energy of the hot body decreases</p> Signup and view all the answers

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