Questions and Answers
In the absence of air friction, the vertical component of a projectile's velocity doesn't change as the projectile moves.
False
A baseball is hurled into the air at an angle of 30 degrees above the horizontal. The baseball will also land on the target if it is thrown from an angle of:
After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is:
Will a vector at 45 degrees to the horizontal be larger or smaller than its horizontal and vertical components? By how much?
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Why does a bowling ball move without acceleration when it rolls along a bowling alley?
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How should a person aim the arrow containing the food when the monkey drops from the tree at the same instant?
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Which of the following statements is true if an athlete throws a ball with a velocity of 40 m/s at an angle of 20 degrees above the horizontal?
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For general projectile motion, which statement is true when the projectile is at the initial and final points of the parabolic path?
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When James drops straight down and John jumps with an initial horizontal velocity of 25 m/s into the lake below, which statement is true?
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When Mary throws her snowball downward at 30 degrees below the horizontal and Debra throws her snowball upward at 30 degrees, which statement is true?
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If the initial speed of a projectile is doubled, what happens to its range?
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What is the term for change of velocity over time within circular motion, where the direction of acceleration is always towards the center?
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What is the name of the net force directed toward the center of a circle?
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What does the term 'centripetal' refer to?
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What is instantaneous linear acceleration directed along the tangent to the object's circular path called?
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What is the term for the 'center-fleeing' force that is not a real force?
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What is the rotational speed on a merry-go-round?
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What is the tangential speed on a merry-go-round?
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Study Notes
2D Projectile Motion Key Concepts
- The vertical component of a projectile's velocity is always affected by gravity; thus, it does not remain unchanged.
- A baseball thrown at angles of 30 degrees and 60 degrees will land on the same target when thrown from the same height.
Acceleration and Velocity
- A rock’s acceleration remains constant as it rises and falls, even at the peak of its trajectory.
- The magnitude of horizontal and vertical components of velocity in general projectile motion is equal at the initial and final points of the path.
Forces in Motion
- A rolling bowling ball maintains a constant velocity due to a lack of horizontal force.
- In circular motion, centripetal acceleration always directs towards the center of the circular path, defining the object's movement along that path.
Projectile Launch and Aim
- When aiming to feed a monkey dropping from a tree, a person should aim directly at the monkey to ensure success, as both will be affected by gravity simultaneously.
Comparative Motion
- When James drops straight down and John jumps off the edge, John will splash down with a higher speed due to his initial horizontal velocity.
- Snowballs thrown downward and upward at the same speed will have Mary’s snowball remain in the air longer than Debra’s.
Range and Speed Relationships
- Doubling a projectile's initial speed results in quadrupling its range.
- The centripetal force is the net force directed towards the center of the motion, such as friction or applied force.
Motion on a Merry-Go-Round
- Rotational speed remains consistent for all individuals on a merry-go-round.
- Individuals positioned farther from the center experience greater tangential speed, being the linear speed of an object along the circular path.
Additional Concepts
- Tangential acceleration represents the instantaneous linear acceleration directed along the tangent to an object's circular path.
- Centrifugal force, while not a real force, describes the sensation of being pushed outward due to an object’s inertia while moving in a circular path.
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Description
Test your knowledge of 2D projectile motion with these flashcards. This quiz covers key concepts such as the effects of gravity on projectile velocity and the dynamics of projectiles launched at angles. Perfect for students who want to reinforce their understanding of motion in physics.