Physics: Horizontally Launched Projectile
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Questions and Answers

If an object is thrown horizontally off a cliff, what is its initial vertical velocity?

  • 10 m/s
  • It varies based on height
  • 9.81 m/s
  • 0 m/s (correct)
  • When two balls are released from the same height, one dropped and one thrown horizontally, which statement is true about their motion?

  • The thrown ball hits the ground first due to its horizontal speed.
  • The dropped ball hits the ground first because it has an initial downward velocity.
  • The balls will hit the ground at different times due to air resistance.
  • Both balls hit the ground at the same time. (correct)
  • What is the horizontal acceleration of an object projected horizontally if we neglect air resistance?

  • 9.81 m/s²
  • -9.81 m/s²
  • It depends on the initial speed
  • 0 m/s² (correct)
  • What is the vertical acceleration for an object in free fall?

    <p>-9.81 m/s² (C)</p> Signup and view all the answers

    Which of the following is true about the horizontal and vertical motions of an object launched horizontally?

    <p>They occur simultaneously and are independent. (B)</p> Signup and view all the answers

    If a package is dropped from a plane flying with a constant velocity, where should it be released for it to land directly below the plane?

    <p>In front of the plane, taking into account horizontal distance. (C)</p> Signup and view all the answers

    Which equation best represents the horizontal motion of an object thrown with an initial horizontal velocity?

    <p>Vx = Vix + ax * t (D)</p> Signup and view all the answers

    What role does air resistance play in the motion of a horizontally launched projectile under ideal conditions?

    <p>It has no effect; horizontal motion is constant. (A)</p> Signup and view all the answers

    Study Notes

    Horizontally Launched Projectile

    • A horizontally launched projectile experiences two independent motions: horizontal and vertical.
    • The horizontal motion has a constant velocity, neglecting air resistance.
    • The vertical motion experiences constant downward acceleration due to gravity (-9.81 m/s²).
    • Both components affect the object's trajectory.

    Think Pair Share

    • Dropping a package from an airplane: Release the package when at the same horizontal position as the drop zone.
    • The horizontal velocity of the plane and the package is the same. This ensures the package lands below the plane.

    Observe-Infer-Wonder

    • Throwing a tennis ball horizontally alongside dropping another tennis ball simultaneously: Both balls hit the ground at the same time.
    • The vertical motion, influenced by gravity and time, dictates the fall. The horizontal motion has no impact on the time taken to reach the ground.

    Demo

    • This is a confirmation of the principle of independent vertical motion.

    Answer

    • Objects thrown horizontally from the same height hit the ground at the same time,regardless of horizontal velocity.

    Big Takeaway

    • Horizontal and vertical motions are independent.
    • Time to reach the ground is the same for both objects.

    2-Dimensional Motion

    • The combination of horizontal and vertical motion describes two-dimensional motion.

    Objects Propelled Horizontally

    • Objects fall vertically at a constant rate of -9.81 m/s².
    • Objects have both horizontal and vertical velocities and accelerations.
    • The horizontal and vertical motions are independent of each other.

    Formulas

    • Horizontal Velocity = Vx

    • Horizontal Acceleration = ax

    • Vertical Velocity = Vy

    • Vertical Acceleration = ay

    • Initial Horizontal Velocity = Vix

    • Initial Vertical Velocity = Viy

    • Vix is determined by the launch; it is constant (neglecting air resistance)

    • ax = 0 m/s²

    • Viy = 0 m/s (initial vertical velocity)

    • Vertical motion: affected by gravity's acceleration (g = -9.8 or -10 m/s²)

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    Description

    Explore the principles of horizontally launched projectiles, focusing on the independent motions of horizontal velocity and vertical acceleration due to gravity. This quiz discusses real-world applications, including package drops from airplanes and simultaneous drops of tennis balls, illustrating key concepts in projectile motion.

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