Energy Conversion in Nature Discussion
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Questions and Answers

What is the SI unit of work?

  • Joule (correct)
  • Watt
  • Metre
  • Newton

    • Which type of energy is possessed by an object in motion?

  • Potential Energy
  • Kinetic Energy (correct)
  • Chemical Energy
  • Heat Energy

    • What is the formula for calculating gravitational potential energy?

  • $mg$
  • $2mv$
  • $mgh$ (correct)
  • $rac{1}{2}mv^2$

    • According to the law of conservation of energy, what happens to the total energy before and after an energy transformation?

    <p>Remains constant</p> Signup and view all the answers

    What is the rate of doing work defined as?

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

    What is the main concept discussed in the text?

    <p>Law of conservation of energy</p> Signup and view all the answers

    Which activity from the text involves discussing energy conversions in nature?

    <p>Activity 10.13</p> Signup and view all the answers

    Why does the law of conservation of energy state that total energy remains unchanged?

    <p>Energy cannot be created or destroyed</p> Signup and view all the answers

    Which concept is exemplified by fuels like coal and petroleum according to the text?

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

    In which activity from the text is a list of human activities and gadgets involving energy conversion made?

    <p>Activity 10.14</p> Signup and view all the answers

    What is the correct formula to calculate potential energy?

    <p>Ep = mgh</p> Signup and view all the answers

    Which factor is NOT considered in the calculation of kinetic energy?

    <p>Height of the object</p> Signup and view all the answers

    In terms of energy transformation, what does power measure?

    <p>Speed of work done</p> Signup and view all the answers

    If an agent does work W in time t, how is power defined?

    <p>Power = work / time</p> Signup and view all the answers

    What would happen if nature did not allow for the transformation of energy?

    <p>Life would not be possible</p> Signup and view all the answers

    When a force is applied to an object and it undergoes a displacement, what is the quantity that measures the work done?

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

    If an object possesses energy solely due to its position or configuration, what form of energy does it have?

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

    According to the law of conservation of energy, when an object loses energy, what happens to the total energy of the system?

    <p>The total energy of the system remains constant</p> Signup and view all the answers

    When a balloon is pressed and its shape changes, what energy transformation occurs?

    <p>Mechanical energy to sound energy</p> Signup and view all the answers

    If an object possesses energy solely due to its motion, what form of energy does it have?

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

    If a force of 20 N acts on an object and displaces it by 5 m in the direction of the force, what is the work done by the force?

    <p>$100 J$</p> Signup and view all the answers

    An object of mass 2 kg is raised vertically by 3 m. If the acceleration due to gravity is 9.8 m/s², what is the increase in the potential energy of the object?

    <p>$58.8 J$</p> Signup and view all the answers

    A ball of mass 0.5 kg is thrown vertically upward with an initial speed of 10 m/s. What is the kinetic energy of the ball at the highest point of its trajectory?

    <p>$0 J$</p> Signup and view all the answers

    According to the law of conservation of energy, if a system undergoes a transformation from state A to state B, what can be said about the total energy of the system?

    <p>The total energy of the system remains constant.</p> Signup and view all the answers

    In the process of winding a toy car, which of the following energy transformations occur?

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

    Which of the following best describes the relationship between the depth of the depression made by the ball and the height from which it was dropped?

    <p>The depth of the depression is directly proportional to the square of the height from which the ball was dropped.</p> Signup and view all the answers

    If the trolley in the second activity has a mass of 2 kg and the wooden block has a mass of 1 kg, what is the total kinetic energy of the system just before the collision?

    <p>$\frac{1}{2}mv^2$, where $m$ is the mass of the trolley and $v$ is its velocity just before the collision.</p> Signup and view all the answers

    If the work done by the force on the trolley is equal to the change in its kinetic energy, what can be said about the force acting on the trolley?

    <p>The force is constant and acts in the same direction as the motion of the trolley.</p> Signup and view all the answers

    According to the law of conservation of energy, what can be said about the total energy of the system consisting of the trolley and the wooden block before and after the collision?

    <p>The total energy of the system is conserved, provided there are no external forces acting on the system.</p> Signup and view all the answers

    Which of the following energy transformations occur during the collision between the trolley and the wooden block?

    <p>The kinetic energy of the trolley is transformed into potential energy of the block, and some energy is dissipated as heat due to friction.</p> Signup and view all the answers

    What is the work done by the force of gravity on an object moving in a circular path?

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

    When a battery lights a bulb, which form of energy transformation primarily takes place?

    <p>Chemical to electrical energy</p> Signup and view all the answers

    If an object's potential energy is 200 J at a certain height, what will be its kinetic energy at that point?

    <p>400 J</p> Signup and view all the answers

    Does a bicycle's motion violate the law of conservation of energy even though various energy transformations occur?

    <p>No, because all energy transformations are accounted for</p> Signup and view all the answers

    When you push a rock with all your might and it doesn't move, where does the energy you spend primarily go?

    <p>Dissipated as frictional heat</p> Signup and view all the answers

    What is the relationship between the work done by a force on an object and the displacement of the object?

    <p>Independent of displacement</p> Signup and view all the answers

    If a mass is lifted vertically and then lowered back, does its total mechanical energy remain constant throughout?

    <p>Yes, due to conservation of mechanical energy</p> Signup and view all the answers

    What happens to the gravitational potential energy of an object as it falls freely towards the ground?

    <p>It decreases progressively</p> Signup and view all the answers

    When an object is at rest on a table, what type of energy does it possess primarily?

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

    What does it imply if a force exerted on an object does no work on it?

    <p>The force and displacement are perpendicular</p> Signup and view all the answers

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