2017 AP Physics 1 Free Response #4
TLDRIn this educational video, Alan from Bothell STEM tackles a free response question from the AP Physics 1, 2017 exam. He discusses two scenarios involving blocks launched horizontally from different heights on a frictionless slide, explaining the principles of energy conservation and potential energy conversion. Alan initially struggles with the question, which involves the blocks' velocities and landing distances, but eventually clarifies the concepts. He emphasizes the importance of understanding the relationship between potential and kinetic energy and the impact of different slide angles on the blocks' trajectories. The video ends with a reflection on the learning process and an invitation for viewers to engage with the content.
Takeaways
- 📚 Alan is discussing a free response question from the AP Physics 1, 2017 exam.
- 🧩 The scenario involves two teams using low-friction slides to launch blocks horizontally from a lab table.
- 🔍 Team one's table is lower, and they compensate by raising the slide, while Team two's slide is at the same height as Team one's block leaves the slide.
- 📏 Both blocks are released from the same height above the table, but Team one's block has more potential energy to convert into kinetic energy.
- 🚀 Due to the conservation of energy, Team one's block, which starts with more potential energy, will have a higher velocity and land further.
- 🔄 In another experiment, two slides of different shapes are used, but both have the same height, leading to the same potential energy conversion and thus the same velocity for both blocks.
- 🌐 Both blocks in the second experiment will travel the same distance because they are launched horizontally at the same height with the same initial velocity.
- 🕒 The blocks in the second experiment will hit the floor at the same time since they have no initial vertical velocity and start at the same height, affected only by gravity.
- 🤔 Alan initially misunderstood the question, thinking that the block on the steeper slide would hit the floor first, but later realized the blocks would fall at the same rate due to gravity.
- 📉 Alan acknowledges his mistake in reasoning and admits that he did not get the question right, highlighting the importance of careful analysis in problem-solving.
- 👨🏫 The video serves as an educational example of how even experts can make mistakes and emphasizes the value of learning from them.
Q & A
What is the context of the video script provided?
-The script is a transcript from a video by Alan with Bothell STEM, discussing a free-response question from the AP Physics 1, 2017 exam.
What is the main topic of the AP Physics 1 question discussed in the video?
-The question involves the principles of conservation of energy and the effects of different slide heights and shapes on the horizontal launch of blocks.
Why does the block on Team One's slide land further away?
-The block on Team One's slide lands further away because it starts with more potential energy due to a greater initial height, which is converted into kinetic energy.
What is the assumption made about the slides in the experiment?
-The assumption is that the slides are frictionless or have very low friction, ensuring that all potential energy is converted to kinetic energy without energy loss.
How does the shape of the slide affect the block's horizontal launch?
-The shape of the slide does not affect the horizontal launch distance if the initial and final heights are the same, as the same potential energy is converted into kinetic energy.
What is the relationship between potential energy and the change in height?
-Potential energy is directly proportional to the change in height. A smaller change in height results in less potential energy being converted into kinetic energy.
Which block hits the floor first, and why?
-Both blocks hit the floor at the same time because they are launched horizontally from the same initial height with no initial vertical velocity, and gravity affects them equally.
What is the key to understanding the problem of the two different slides with the same height?
-The key is understanding that the potential energy conversion to kinetic energy is the same for both slides, resulting in the same velocity and horizontal distance traveled.
What mistake did Alan initially make in his reasoning about the problem?
-Alan initially thought that the block on the steeper slide would land further due to a higher velocity, but he later realized that both blocks would have the same velocity by the time they land.
What lesson can be learned from Alan's experience with this problem?
-The lesson is the importance of carefully considering all aspects of a physics problem and not making assumptions without fully analyzing the situation, as even experts can make mistakes.
How does Alan conclude the video after making a mistake in his explanation?
-Alan acknowledges his mistake, explains the correct reasoning, and encourages viewers to learn from his experience, emphasizing the importance of understanding the problem-solving process.
Outlines
📚 AP Physics 1 Exam Question Analysis
In this paragraph, Alan from Bothell STEM coach discusses a free-response question from the AP Physics 1, 2017 exam. The question involves a physics scenario where blocks are launched horizontally from different heights on a low-friction slide. Alan explains the concept of conservation of energy, stating that the block with more potential energy will have a greater velocity and thus travel further. He also addresses a second scenario with differently shaped slides but the same height, concluding that both blocks will travel the same distance due to the same potential energy conversion. Alan also discusses the timing of the blocks hitting the floor, emphasizing that they will fall at the same rate due to gravity, starting with no initial vertical velocity.
🤔 Reflecting on a Tricky Physics Question
Alan revisits the question, acknowledging a misunderstanding in his initial analysis. He corrects his approach by considering the acceleration due to the steeper slide, which causes block two to reach a higher velocity faster. Despite this, he confirms that both blocks will hit the floor at the same time because they are subject to the same gravitational forces and start from the same height without any initial vertical velocity. Alan admits his mistake and expresses his disappointment, but uses it as a teaching moment, emphasizing the importance of not looking at the solution before attempting the problem to avoid such errors.
Mindmap
Keywords
💡AP Physics 1
💡Low friction slide
💡Conservation of energy
💡Potential energy
💡Kinetic energy
💡Horizontal launch
💡Projectile motion
💡Frictionless
💡Velocity
💡Free-response question
💡Mistake in reasoning
Highlights
Alan from Bothell STEM is coaching through a free response question from the AP Physics 1 2017 exam.
The question involves a low friction slide launching a block horizontally from a lab table at height D.
Team 1 compensates for a lower table by constructing a slide that raises the block to the same height H as Team 2's block.
Due to the conservation of energy, Team 1's block will have a lower velocity and land further because it starts with more potential energy.
In a second experiment, two different shaped slides with the same height are used, and both blocks are released from rest.
The blocks will land the same distance away because the same amount of potential energy is converted into kinetic energy.
Both blocks will hit the floor at the same time since they start with no initial vertical velocity and fall at the same rate.
The question asks which block will hit the floor first, and the initial reasoning was that they would hit at the same time.
However, upon further analysis, it's realized that Block 2 will hit the floor first due to its steeper slide, even though they end with the same velocity.
The initial reasoning was incorrect, and the correct answer is that Block 2 will hit the floor first.
The scoring guidelines confirm that the potential energy change is smaller for Block 2, resulting in a lower velocity.
The video demonstrates the importance of carefully considering all aspects of a problem before jumping to conclusions.
Alan admits the mistake and emphasizes the value of working through problems without looking at solutions first.
The video serves as a learning experience, showing that even experts can make mistakes and learn from them.
Alan encourages viewers to leave comments, likes, or subscribe for more educational content.
The next video will cover the final free response question from the AP Physics 1 exam.
Transcripts
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