Physics Momentum Exercises
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Questions and Answers

What is the initial momentum of the system before any collisions occur?

  • 8 kg m/s
  • 6 kg m/s
  • 14 kg m/s
  • 0 kg m/s (correct)
  • What is the final velocity of ball A after the collision in Exercise I?

  • 0.54 m/s
  • 0.15 m/s
  • 0.09 m/s (correct)
  • 0.4 m/s
  • In Exercise II, what is the velocity of ball A before any collision occurs?

  • 8/3 m/s (correct)
  • 3/4 m/s
  • 0 m/s
  • 2.67 m/s
  • What key principle is used to analyze the collisions in the exercises?

    <p>Conservation of momentum</p> Signup and view all the answers

    Which of the following correctly describes the relationship between the masses and velocities of the balls in Exercise II?

    <p>Heavier balls will move slower post-collision if momentum is conserved.</p> Signup and view all the answers

    Study Notes

    Exercise I

    • Three balls (A, B, and C) with masses 2 kg, 4 kg, and 8 kg respectively.
    • Ball A is moving to the left at 3/4 m/s, ball B and C are stationary.
    • The system is smooth.
    • The initial momentum of the ball system is 0.
    • The final momentum of the ball system is also 0.
    • The velocity after the collision of all balls is calculated.

    Exercise II

    • Similar setup to Exercise I, but with different initial conditions.
    • Mass of A = 2 kg, Mass of B = 2 kg, Mass of C = 8 kg.
    • Initial velocities: A = 8/3 m/s, B = 0 m/s, C = 3/4 m/s.
    • The velocities of the balls are calculated after each collision, utilizing conservation of momentum and kinetic energy.
    • The time and distance for successive collisions are also calculated.

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    Description

    Test your understanding of momentum with two practical exercises involving three balls of different masses. In the first exercise, analyze the collision of balls moving at specified velocities; in the second, extend your knowledge with a different set of initial conditions. Use conservation of momentum and kinetic energy principles to solve for final velocities.

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