Podcast
Questions and Answers
How would the trajectory of the stunt dummy appear to an observer on the ground?
How would the trajectory of the stunt dummy appear to an observer on the ground?
- A zigzag motion
- A parabolic projectile path (correct)
- A straight line toward the airplane
- A curved line upward
What components of motion does the stunt dummy exhibit after being dropped from the airplane?
What components of motion does the stunt dummy exhibit after being dropped from the airplane?
- Only horizontal component of velocity
- Only vertical component of velocity
- No velocity components
- Vertical and horizontal components of velocity (correct)
If a baseball is thrown opposite to the motion of a train, how do you calculate its velocity relative to Earth?
If a baseball is thrown opposite to the motion of a train, how do you calculate its velocity relative to Earth?
- Add the speed of the train and the baseball's speed
- Ignore the train's speed and use only the baseball's speed
- Multiply the speed of the train by the speed of the baseball
- Subtract the baseball's speed from the speed of the train (correct)
In a vacuum, what would be the behavior of a freely falling object compared to an object moving horizontally?
In a vacuum, what would be the behavior of a freely falling object compared to an object moving horizontally?
What happens to the velocity of an object in free fall over time?
What happens to the velocity of an object in free fall over time?
What would be the effect of air resistance on the stunt dummy's trajectory?
What would be the effect of air resistance on the stunt dummy's trajectory?
Which scenario best illustrates positive velocity with negative acceleration?
Which scenario best illustrates positive velocity with negative acceleration?
If two observers describe the same object's motion, they might not agree on several features. Why is this?
If two observers describe the same object's motion, they might not agree on several features. Why is this?
What is the velocity of the ball at the peak of its upward motion?
What is the velocity of the ball at the peak of its upward motion?
What is the value of the acceleration of the ball during its entire motion?
What is the value of the acceleration of the ball during its entire motion?
How does the slope of the velocity-time graph relate to the acceleration of the ball?
How does the slope of the velocity-time graph relate to the acceleration of the ball?
What happens to the ball's velocity immediately after it reaches 0 m/s at the peak?
What happens to the ball's velocity immediately after it reaches 0 m/s at the peak?
Which of the following best describes free fall motion?
Which of the following best describes free fall motion?
In the context of the ball's motion, what does a negative acceleration indicate?
In the context of the ball's motion, what does a negative acceleration indicate?
During which part of its motion is the ball's velocity actually 0 m/s?
During which part of its motion is the ball's velocity actually 0 m/s?
What is the relationship between upward motion and acceleration in free fall?
What is the relationship between upward motion and acceleration in free fall?
What happens to the velocity of an object thrown upward as it rises?
What happens to the velocity of an object thrown upward as it rises?
What is the acceleration of an object in free fall, regardless of its direction of motion?
What is the acceleration of an object in free fall, regardless of its direction of motion?
At the peak of its path, what is the velocity of an object thrown upward?
At the peak of its path, what is the velocity of an object thrown upward?
When an object in free fall has negative velocity, what does that imply about its motion?
When an object in free fall has negative velocity, what does that imply about its motion?
How can the motion of an object be described when it is moving upward with a positive velocity while experiencing negative acceleration?
How can the motion of an object be described when it is moving upward with a positive velocity while experiencing negative acceleration?
What occurs to the position of an object experiencing a downward acceleration while moving upward?
What occurs to the position of an object experiencing a downward acceleration while moving upward?
Which of the following accurately describes the motion of an object right before it reaches its peak height?
Which of the following accurately describes the motion of an object right before it reaches its peak height?
If an object is thrown upwards with an initial velocity, when does it experience the maximum negative acceleration?
If an object is thrown upwards with an initial velocity, when does it experience the maximum negative acceleration?
Flashcards
Free fall acceleration
Free fall acceleration
The constant downward acceleration experienced by objects in free fall, approximately 9.81 m/s².
Downward acceleration
Downward acceleration
The acceleration of an object moving in the downward direction.
Upward motion acceleration
Upward motion acceleration
While moving upward, an object experiences downward acceleration, slowing it down.
Velocity = 0 (at peak)
Velocity = 0 (at peak)
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Negative acceleration
Negative acceleration
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Negative velocity
Negative velocity
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Constant acceleration in free fall
Constant acceleration in free fall
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Object speeding up (free fall)
Object speeding up (free fall)
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Velocity at Peak
Velocity at Peak
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Acceleration in Free Fall
Acceleration in Free Fall
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Constant Acceleration
Constant Acceleration
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What happens to velocity after 2 seconds?
What happens to velocity after 2 seconds?
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Velocity-Time Graph
Velocity-Time Graph
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What does a straight line on the graph indicate?
What does a straight line on the graph indicate?
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Acceleration at the peak
Acceleration at the peak
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Relationship between velocity and acceleration
Relationship between velocity and acceleration
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Frames of reference
Frames of reference
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How does relative velocity affect motion?
How does relative velocity affect motion?
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Horizontal component of velocity
Horizontal component of velocity
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Vertical component of velocity
Vertical component of velocity
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Projectile motion
Projectile motion
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Does air resistance affect projectile motion?
Does air resistance affect projectile motion?
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Negligible air resistance
Negligible air resistance
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Study Notes
Section 3: Falling Objects
- Freely falling bodies experience constant acceleration due to gravity
- Objects of different masses fall at the same rate in a vacuum
- Free fall acceleration (g) is approximately 9.81 m/s² on Earth
Free Fall
- Free fall occurs when only gravity acts on an object
- Displacement increases with each time interval
- Velocity increases by a constant amount in each time interval
Acceleration is constant during upward and downward motion
- Objects thrown upwards experience constant downward acceleration
- Velocity is zero at the peak of the upward motion
- Acceleration remains constant throughout the motion
Vectors indicate direction; scalars do not
- Scalars have magnitude only (e.g., speed, volume)
- Vectors have both magnitude and direction (e.g., velocity, displacement)
Vectors can be added graphically
- Vectors can be added by placing the tail of one vector at the head of another
- The resultant vector is drawn from the tail of the first vector to the head of the last.
- Magnitude measured with a ruler, direction measured with a protractor
Properties of Vectors
- When vectors act at the same point, a resultant vector can be found
- Vectors can be moved parallel to themselves in diagrams
- Vectors can be added in any order
Multiplying or dividing vectors by scalars results in vectors
- Multiplying a vector by a scalar changes the magnitude but not the direction
- Multiplying a vector by a NEGATIVE scalar reverses the direction
Section Review
- Review of scalar and vector quantities
- Examples of quantities in a given situation
Projectile Motion
- Projectiles follow parabolic paths
- Projectile motion is free fall with an initial horizontal velocity
- Horizontal velocity remains constant during projectile motion
- Vertical motion is affected by gravity
Vertical Motion of a Projectile that Falls from Rest
- Equations relate vertical velocity, acceleration, and displacement
Projectiles Launched Horizontally
- Constant horizontal velocity during projectile motion
- Vertical displacement due to constant acceleration due to gravity
Projectiles Launched at an Angle
- Initial velocity has horizontal and vertical components
- Horizontal motion analyzed using horizontal components
- Vertical motion analyzed using vertical components
Relative Motion
- Velocity measurements differ in frames of references
- Observers in different frames will measure different displacements (distances) and velocities of objects
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Description
This quiz covers essential concepts in physics related to falling objects and motion, focusing on the effects of gravity and how it influences both upward and downward movement. You'll also learn about the distinction between scalars and vectors, including their properties and how they can be added together. Test your understanding of free fall and the kinematic principles involved.
