Work, Energy, Power and Collision
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Questions and Answers

What is the definition of energy in the context of physics?

  • The amount of force applied to a body
  • The distance a body is displaced
  • The capacity to do work (correct)
  • The ability to do work at a fast pace

    • A force F is applied to a body, making an angle θ with the horizontal. What is the component of the force in the direction of displacement of the body?

  • F secθ
  • F cosθ (correct)
  • F sinθ
  • F tanθ

    • What is a necessary condition for work to be done on a body?

  • A force must be applied to the body
  • The body must be displaced through a certain distance
  • The force must make an angle with the horizontal
  • All of the above (correct)

    • What is the term associated with speed in the context of karate?

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

    What is the correlation between the physical definitions of work, energy, and power and the physiological pictures they generate in our minds?

    <p>There is a loose correlation</p> Signup and view all the answers

    What is the work done by the force in displacing a body from x = 1 cm to x = 5 cm?

    <p>20 ergs</p> Signup and view all the answers

    What is the initial kinetic energy of the body?

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

    What is the final kinetic energy of the body when the distance covered is 5m?

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

    What is a characteristic of a conservative field?

    <p>Work done is independent of the path followed</p> Signup and view all the answers

    What is the unit of resistive force in the graph?

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

    What is the expression for kinetic energy of a body?

    <p>½ mv^2</p> Signup and view all the answers

    What is the work done on a body when its velocity increases from 0 to v?

    <p>½ mv^2</p> Signup and view all the answers

    What is the relation between the work done and the kinetic energy of a body?

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

    What is the direction of the displacement of the body when a force is applied on it?

    <p>Parallel to the direction of the force</p> Signup and view all the answers

    What is the property of kinetic energy of a body?

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

    What is the primary characteristic of a force that enables it to do work on a body?

    <p>Its ability to cause displacement</p> Signup and view all the answers

    What is the energy unit equivalent to 3.6 × 10⁶ J?

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

    What is the significance of the angle θ in the resolution of the force F into its components?

    <p>It determines the component of the force in the direction of displacement</p> Signup and view all the answers

    What is the relationship between the capacity to do work and the term 'energy'?

    <p>Energy is the capacity to do work</p> Signup and view all the answers

    What type of energy is possessed by a moving vehicle?

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

    What is the energy stored in a metallic wire when stretched by suspending a weight Mg?

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

    What is the condition under which work is said to be done on a body?

    <p>When a force applied to the body displaces it through a certain distance</p> Signup and view all the answers

    What is the association between the term 'power' and the concept of speed?

    <p>Power is associated with speed in karate</p> Signup and view all the answers

    What is the application of kinetic energy in wind mills?

    <p>Generation of electrical energy</p> Signup and view all the answers

    What is the energy possessed by a bullet fired from a gun?

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

    What is the type of energy released in a nuclear bomb due to mass defect?

    <p>Gamma radiation</p> Signup and view all the answers

    What is the energy unit equivalent to 1000 calories?

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

    What is the process in which a photon interacts with a nucleus to produce a particle-antiparticle pair?

    <p>Pair production</p> Signup and view all the answers

    What is the device that converts light energy into electrical energy?

    <p>Photoelectric cell</p> Signup and view all the answers

    What is the energy gained by a charged particle when accelerated through a potential difference of V volts?

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

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