21st Century Skills: Satellites and Forces
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Questions and Answers

Which of the following is true about the work done when lifting a book slowly versus quickly?

  • Lifting slowly requires less energy.
  • The amount of work done is the same in both cases. (correct)
  • More work is done when lifting faster.
  • Work is only done during the faster lift.

    • What is the reason satellites orbit Earth without changing speed?

  • The force of gravity is perpendicular to the displacement. (correct)
  • There is continuous work being done on the satellite.
  • The displacement of the satellite is always increasing.
  • The gravitational force is stronger than other forces.

    • How is power defined in the context of work done?

  • Power is the force multiplied by distance.
  • Power is velocity times time.
  • Power is work done divided by time interval. (correct)
  • Power is the amount of work done.

    • If a satellite experiences zero work, what can be concluded about its speed?

    <p>Its speed remains constant.</p> Signup and view all the answers

    What is the correct formula for power when net force and displacement are in the same direction?

    <p>P = W/t</p> Signup and view all the answers

    Why might lifting a book slowly feel more tiring than lifting it quickly?

    <p>More time is spent exerting force at a slow pace.</p> Signup and view all the answers

    Which factor does NOT affect the amount of work done on an object?

    <p>The speed of the object.</p> Signup and view all the answers

    Which situation best represents negative work?

    <p>A person catching a falling ball.</p> Signup and view all the answers

    In physics, what role does displacement play in the calculation of work?

    <p>It must be parallel to the force for work to be done.</p> Signup and view all the answers

    What happens to power when the time interval for doing work decreases while the work done remains constant?

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

    Study Notes

    Satellite Motion and Work

    • Satellites orbit Earth maintaining a constant speed due to the balance of forces.
    • Work is defined as the product of net force and displacement.
    • For work to occur, force must align with displacement; if not, no work is done.
    • Gravity provides the force on satellites, but this force is perpendicular to their displacement, resulting in zero net work.
    • Zero work leads to no change in speed during orbital motion.

    Demonstrating Different Types of Work

    • Engage in activities that showcase zero work, negative work, and positive work.
    • Collaborate with a partner to identify the type of work being demonstrated and discuss reasoning.

    Understanding Power

    • Work is constant regardless of the speed of lifting an object, as long as the force and displacement are consistent.
    • Lifting an object slowly expends more energy over time compared to lifting it quickly.
    • The concept of power measures how quickly work is performed.
    • Power is calculated using the formula:
      • Power = work done / time interval (P = W/t)
    • When net force and displacement are aligned, power can also be expressed as:
      • P = Fnet V where V is the velocity of the object.

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    Description

    Explore the fascinating reasons why satellites maintain their orbits around Earth without altering their speed. This quiz provides insights into the concepts of force, displacement, and gravity that keep satellites in motion. Test your understanding of these fundamental principles!

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