Gr 10 Physical Sciences Ch 17: Conservation of mechanical energy
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Questions and Answers

What is the fundamental principle that applies to all types of energy?

  • Energy can only be converted from potential to kinetic
  • Energy cannot be created or destroyed but can only change from one form to another (correct)
  • Energy can be created or destroyed
  • Energy can only be converted from mechanical to kinetic

    • What is the unit symbol for mechanical energy?

  • kg
  • J (correct)
  • s
  • m

    • What is the formula for mechanical energy?

  • E_M = E_P + E_K (correct)
  • E_M = E_P - E_K
  • E_M = E_P × E_K
  • E_M = E_P / E_K

    • What is the condition for the Law of Conservation of Mechanical Energy to be applicable?

    <p>In the absence of dissipative forces</p> Signup and view all the answers

    What is the formula for gravitational potential energy?

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

    What is the formula for kinetic energy?

    <p>E_K = ½mv²</p> Signup and view all the answers

    What is the importance of the Law of Conservation of Mechanical Energy?

    <p>It simplifies the analysis of systems by allowing us to focus on the energy states</p> Signup and view all the answers

    What is conserved in a closed system without dissipative forces?

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

    What is the significance of the Law of Conservation of Mechanical Energy in problem-solving?

    <p>It helps us focus on the energy states rather than the detailed path taken by objects.</p> Signup and view all the answers

    In a closed system, what happens to the mechanical energy in the presence of dissipative forces?

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

    What is the relationship between the total mechanical energy and the sum of kinetic and potential energies?

    <p>The total mechanical energy is equal to the sum of kinetic and potential energies.</p> Signup and view all the answers

    What is conserved in a closed system without dissipative forces, according to the Law of Conservation of Mechanical Energy?

    <p>The total mechanical energy</p> Signup and view all the answers

    What is the result of the transformation of mechanical energy from one form to another in a closed system?

    <p>Mechanical energy remains unchanged.</p> Signup and view all the answers

    Why is the Law of Conservation of Mechanical Energy crucial in understanding physical phenomena?

    <p>It simplifies the analysis of systems by focusing on energy states.</p> Signup and view all the answers

    What is the condition for the total mechanical energy to remain constant?

    <p>The system must be closed with no external forces acting.</p> Signup and view all the answers

    How does the Law of Conservation of Mechanical Energy relate to the concept of energy?

    <p>It states that energy cannot be created or destroyed, only transformed.</p> Signup and view all the answers

    What is the condition for the Law of Conservation of Mechanical Energy to be applicable in a system?

    <p>There are no external dissipative forces acting</p> Signup and view all the answers

    What is the relation between the total mechanical energy and the sum of kinetic and potential energies?

    <p>The total mechanical energy is equal to the sum of kinetic and potential energies</p> Signup and view all the answers

    What happens to the mechanical energy in a closed system without dissipative forces?

    <p>It remains constant</p> Signup and view all the answers

    What is the result of the transformation of mechanical energy from one form to another in a closed system?

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

    Why is the Law of Conservation of Mechanical Energy crucial in understanding physical phenomena?

    <p>It simplifies the analysis of systems by allowing us to focus on the energy states</p> Signup and view all the answers

    What is the significance of the Law of Conservation of Mechanical Energy in problem-solving?

    <p>It makes the problem simpler</p> Signup and view all the answers

    What is the difference between the mechanical energy at two different positions in a closed system without dissipative forces?

    <p>It remains the same</p> Signup and view all the answers

    What is the implication of the Law of Conservation of Mechanical Energy?

    <p>Energy can only be transformed from one form to another</p> Signup and view all the answers

    A 2 kg object is projected upwards from the ground with an initial velocity of 10 m/s. If the air resistance is negligible, what is the total mechanical energy of the object at the highest point?

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

    A 5 kg object is moving with a velocity of 5 m/s on a horizontal surface. If the frictional force is 10 N, what is the rate of change of mechanical energy?

    <p>-50 J/s</p> Signup and view all the answers

    A 10 kg object is lifted from the ground to a height of 10 m. If the gravitational potential energy at the ground is zero, what is the total mechanical energy of the object at the height?

    <p>980 J</p> Signup and view all the answers

    A 2 kg object is moving with a velocity of 10 m/s on a horizontal surface. If the frictional force is 5 N, what is the time it takes for the mechanical energy to reduce to half?

    <p>4 s</p> Signup and view all the answers

    A 5 kg object is projected upwards from the ground with an initial velocity of 20 m/s. If the air resistance is negligible, what is the ratio of kinetic energy to potential energy at the highest point?

    <p>0:1</p> Signup and view all the answers

    A 10 kg object is moving with a velocity of 5 m/s on a horizontal surface. If the frictional force is 10 N, what is the percentage decrease in mechanical energy per second?

    <p>10%</p> Signup and view all the answers

    A 2 kg object is moving with a velocity of 10 m/s on a horizontal surface. If the frictional force is 5 N, what is the distance it travels before the mechanical energy reduces to half?

    <p>40 m</p> Signup and view all the answers

    A 5 kg object is lifted from the ground to a height of 20 m. If the gravitational potential energy at the ground is zero, what is the percentage increase in mechanical energy?

    <p>100%</p> Signup and view all the answers

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