Questions and Answers
What defines a projectile?
A projectile is any object upon which the only force is gravity.
A projectile travels with a circular trajectory.
False
What is the value of vertical acceleration caused by gravity?
Describe how the horizontal velocity of a projectile behaves.
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What happens to the vertical velocity of a projectile each second?
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The horizontal motion of a projectile is independent of its __________.
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For horizontally launched projectiles, what is the initial vertical velocity?
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What are the two equations needed to analyze a projectile's motion in two dimensions?
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The path of a projectile is called a __________.
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How long is the drop in air for a plane traveling at 100 m/s from an altitude of 500 m?
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How far away will the plane land horizontally from where it was launched?
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Study Notes
Characteristics of a Projectile's Trajectory
- A projectile is an object that has only gravity acting upon it.
- Projectiles follow a parabolic trajectory due to gravity's influence.
- There are no horizontal forces acting on projectiles, so there is no horizontal acceleration.
- Horizontal velocity of a projectile is constant, never changing in value.
- Vertical acceleration caused by gravity is 9.8 m/s², downward.
- Vertical velocity of a projectile changes by 9.8 m/s every second.
- Horizontal motion of a projectile is independent of its vertical motion.
Horizontal Velocity Component
- Horizontal velocity remains constant throughout the trajectory.
- Covers equal displacements in equal time periods.
- Initial horizontal velocity equals the final horizontal velocity (constant).
Vertical Velocity Component
- Vertical velocity changes due to gravity.
- Does not cover equal displacements in equal time periods.
- Magnitude and direction change, with magnitude decreasing upward and increasing downward.
Trajectory
- The combination of horizontal and vertical velocity components produces a parabolic trajectory.
Horizontally Launched Projectiles
- Have no upward trajectory and no initial vertical velocity.
- Require two equations for analysis, one for the x-direction and one for the y-direction.
Analyzing a Projectile in 2D
- Equation for the x-direction: x = vox t
- Equation for the y-direction: y = (1/2)gt²
- Velocity is constant horizontally, so acceleration is zero.
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Description
This quiz covers the characteristics of a projectile's trajectory, including its parabolic path, constant horizontal velocity, and vertical acceleration due to gravity. Learn about the key features of projectile motion.
