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Questions and Answers
A projectile is launched at an angle. What best describes the horizontal velocity ($v_x$) of the projectile throughout its flight, assuming negligible air resistance?
A projectile is launched at an angle. What best describes the horizontal velocity ($v_x$) of the projectile throughout its flight, assuming negligible air resistance?
- It decreases due to gravity.
- It remains constant. (correct)
- It increases constantly due to constant acceleration.
- It initially increases, then decreases.
As a projectile moves upwards in its trajectory, what happens to the vertical component of its velocity ($v_y$)?
As a projectile moves upwards in its trajectory, what happens to the vertical component of its velocity ($v_y$)?
- It increases then decreases.
- It increases due to gravity.
- It remains constant.
- It decreases due to gravity. (correct)
Which of the following best describes the acceleration of a projectile in free fall, specifically focusing on the vertical direction?
Which of the following best describes the acceleration of a projectile in free fall, specifically focusing on the vertical direction?
- Decreasing as the object falls.
- Constant and equal to zero.
- Constant and approximately $9.8 m/s^2$ downwards. (correct)
- Increasing as the object falls.
If a projectile is launched upwards, what force primarily influences its motion?
If a projectile is launched upwards, what force primarily influences its motion?
What principle explains why no horizontal forces are needed to maintain a projectile's horizontal motion, assuming negligible air resistance?
What principle explains why no horizontal forces are needed to maintain a projectile's horizontal motion, assuming negligible air resistance?
What happens to the magnitude of the vertical component of a projectile's velocity as it descends, neglecting air resistance?
What happens to the magnitude of the vertical component of a projectile's velocity as it descends, neglecting air resistance?
A projectile is launched at an angle. At the highest point of its trajectory, what is the vertical component of its velocity ($v_y$)?
A projectile is launched at an angle. At the highest point of its trajectory, what is the vertical component of its velocity ($v_y$)?
Considering an angle-launched projectile, which statement accurately describes the forces acting on it during its flight if air resistance is negligible?
Considering an angle-launched projectile, which statement accurately describes the forces acting on it during its flight if air resistance is negligible?
How does the vertical acceleration of a projectile going upwards compare to its vertical acceleration when going downwards, assuming negligible air resistance?
How does the vertical acceleration of a projectile going upwards compare to its vertical acceleration when going downwards, assuming negligible air resistance?
A projectile is launched at an angle of 30° above the horizontal on a level surface. Neglecting air resistance, which of the following is true regarding the projectile's speed just before it hits the ground, compared to its initial speed?
A projectile is launched at an angle of 30° above the horizontal on a level surface. Neglecting air resistance, which of the following is true regarding the projectile's speed just before it hits the ground, compared to its initial speed?
Flashcards
Horizontal Velocity (Vx)
Horizontal Velocity (Vx)
The velocity in the x-direction; remains constant throughout the projectile's flight if air resistance is negligible.
Vertical Velocity (Vy)
Vertical Velocity (Vy)
The velocity in the y-direction; changes due to gravity, decreasing on the way up and increasing on the way down.
Maximum Height (Ymax)
Maximum Height (Ymax)
The maximum height a projectile reaches, where its vertical velocity (Vy) is momentarily zero.
Range (x)
Range (x)
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Projectile going up
Projectile going up
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Projectile going down
Projectile going down
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Acceleration of Projectile
Acceleration of Projectile
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Acceleration
Acceleration
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Study Notes
- A horizontal force does not keep a projectile moving at a constant velocity in the x-axis
- As a projectile goes down, the object experiences constant acceleration, increasing its velocity
- The y-axis of projectile motion follows the principle of free fall
Learning Targets
- Describe the velocity of a projectile in its horizontal and vertical components
Angle-Launched Projectile
Vx or Horizontal Velocity
- The lengths of the arrow are equal
- The velocity is constant
- Acceleration is zero
- No horizontal forces are needed to maintain horizontal motion which follows the concept of inertia
Vy or Vertical Velocity
- Projectile going up:
- The lengths of the arrow become shorter
- The velocity decreases
- Acceleration is 9.8 m/s² (velocity decreases by 9.8 m/s every second)
- The force involved is gravitational force
- Projectile going down:
- The lengths of the arrow become longer
- The velocity increases
- Acceleration is 9.8 m/s² (velocity increases by 9.8 m/s every second)
- The force involved is gravitational force
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