Potential Energy and Work Done Quiz
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Questions and Answers

What is the relationship between work done and the change in kinetic energy of an object?

  • They are equal (correct)
  • Work done is greater than the change in kinetic energy
  • They are inversely proportional
  • There is no relationship between them

    • If an object of mass 15 kg is moving with a uniform velocity of 4 m/s, what is its kinetic energy?

  • 60 J
  • 40 J (correct)
  • 16 J
  • 30 J

    • When the velocity of an object is doubled, what happens to its kinetic energy?

  • Halves
  • Doubles
  • Quadruples (correct)
  • Remains the same

    • What is the kinetic energy possessed by an object of mass 1500 kg moving at a velocity of 50/3 m/s?

    <p>$625000/3$ J</p> Signup and view all the answers

    When the velocity of an object is increased three times, what happens to its kinetic energy?

    <p>Increases by 9 times</p> Signup and view all the answers

    What happens to a rubber band when stretched and then released?

    <p>It regains its original length</p> Signup and view all the answers

    What type of energy is transferred to an object when a rubber band is stretched?

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

    When winding the key of a toy car, the energy transferred to the spring inside is stored as:

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

    What kind of energy is possessed by an object due to its position or configuration?

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

    If you lift an object to a greater height, what happens to the amount of work it can do?

    <p>It can do more work</p> Signup and view all the answers

    What happens when a stretched rubber band is released?

    <p>It returns to its original shape</p> Signup and view all the answers

    In the scenario with the slinky, would the slinky acquire potential energy if compressed instead of stretched?

    <p>No, it would not acquire any energy</p> Signup and view all the answers

    What is the unit of work when a force of 1 N displaces an object by 1 m along the line of action of the force?

    <p>Newton metre (N m)</p> Signup and view all the answers

    When the force on an object is zero, what is the work done?

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

    If an object is displaced by 0 m, what would be the work done?

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

    In which scenario is work done negative according to the explanation provided?

    <p>Force is opposite to the direction of displacement</p> Signup and view all the answers

    What is the work done by a force of 7 N on an object displaced by 8 m in the direction of the force?

    <p>56 J</p> Signup and view all the answers

    In lifting an object upwards, which force does positive work according to the example?

    <p>Force exerted by you</p> Signup and view all the answers

    Which of the following is a correct definition of power?

    <p>Power measures the speed of work done.</p> Signup and view all the answers

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

    <p>$\frac{W}{t}$</p> Signup and view all the answers

    What is the basis for classifying machines like motorbikes and motorcars?

    <p>Their speed of changing energy or doing work</p> Signup and view all the answers

    If two children of the same weight climb up a rope separately and reach a height of 8m, what are they primarily demonstrating?

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

    Why is it important for nature to allow the transformation of energy?

    <p>To conserve energy</p> Signup and view all the answers

    How is power defined in the context of agents transferring energy?

    <p>$\text{Power} = \frac{\text{work}}{\text{time}}$</p> Signup and view all the answers

    What is the formula to calculate power in physics?

    <p>$P = \frac{\text{Force} \times \text{Distance}}{\text{Time}}$</p> Signup and view all the answers

    What is the SI unit of power?

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

    If a lamp consumes 500 J of energy in 5 s, what is its power?

    <p>250 W</p> Signup and view all the answers

    What is the definition of average power?

    <p>Total work done divided by total time taken</p> Signup and view all the answers

    Which formula can be used to calculate power when weight and height are given?

    <p>$P = \frac{\text{Weight} \times \text{Height}}{\text{Time}}$</p> Signup and view all the answers

    What is work done on an object defined as?

    <p>Force multiplied by distance moved in the direction of the applied force</p> Signup and view all the answers

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