2017 AP Physics 1 Free Response #5
TLDRIn this video, Alan from Bothell STEM Coach tackles AP Physics 1's 2017 free response question 5, which involves wave pulses moving in opposite directions on a string. He explains the concept of wave superposition and how to plot the velocity of a point on the string over time. Alan demonstrates the process of sketching the string's shape at different time intervals and provides a clear, step-by-step analysis of the wave's behavior at point P. The video concludes with a successful scoring guide comparison, emphasizing the importance of understanding wave dynamics in physics.
Takeaways
- 📚 Alan is teaching AP Physics 1, focusing on the 2017 free response questions.
- 🔍 The session continues from previous lessons, where they have been tackling the questions with mostly good progress.
- ❗ The fourth question had a tricky mistake, but overall, the questions are manageable.
- 🌊 Question 5 involves wave pulses traveling in opposite directions on a string.
- 📏 The string's shape at time T equals 0 is described, with pulses moving at a speed of one unit per second.
- 🕒 Between times T equals 0 and 5 seconds, the left-hand pulse's interaction with point P on the string is analyzed.
- 📈 Alan explains the need to plot the velocity of the piece of string at Point P over the given time period.
- 📉 Initially, at T=0, Point P does not move, but by T=1 second, it moves up one centimeter.
- 🔄 The velocity of Point P is constant, moving at a rate of one centimeter per second, then it drops back to zero by T=4 seconds.
- 📊 At T=5 seconds, the pulses completely overlap, and the string's shape is sketched to illustrate this.
- 📝 Alan demonstrates how to numerically add points to determine the string's shape during the overlap.
- 🎯 The scoring guide is mentioned, indicating that the solution provided is correct and earns full credit.
Q & A
What is the main topic of the video?
-The main topic of the video is solving the AP Physics 1 2017 free response question number 5, which deals with wave pulses traveling in opposite directions on a string.
What mistake did the speaker mention regarding question number 4?
-The speaker mentioned making a tricky mistake on question number 4 but did not specify the exact mistake in this transcript.
What is the speed of each wave pulse mentioned in the video?
-Each wave pulse is moving at a speed of one unit per second.
What is the task given in the wave question?
-The task is to plot the velocity of a piece of string located at point P as a function of time between 0 and 5 seconds.
What happens to the point P on the string in the first second?
-In the first second, point P does not move at all.
How does point P move between the first and second second?
-Between the first and second second, point P moves up one centimeter in one second, indicating a constant velocity of one centimeter per second.
Describe the movement of point P from second two to three.
-From the second second to the third second, point P continues moving up at the same constant velocity and hits the peak.
What happens to point P between the third and fourth second?
-Between the third and fourth second, point P drops all the way down to zero, moving down two centimeters in one second.
How do the wave pulses interact when they completely overlap at T equals five seconds?
-When the wave pulses completely overlap at T equals five seconds, their slopes cancel each other out, resulting in the string being at the equilibrium position at point P.
What does the speaker use to confirm their solution?
-The speaker uses the scoring guide and numerical addition of points to confirm their solution, ensuring that the plot and diagrams are correct.
What is the speaker's overall impression of their performance on the 2017 AP Physics 1 free response questions?
-The speaker feels that they did well overall, understanding the reasoning behind most questions and solving them correctly, even though they made a mistake on question number 4.
Outlines
📚 AP Physics 1: Wave Question Analysis
In this segment, Alan from Bothell STEM Coach discusses the AP Physics 1 2017 free response question 5, which involves wave pulses traveling in opposite directions on a string. The question requires plotting the velocity of a piece of string at point P from time 0 to 5 seconds. Alan explains the process of solving the problem by sketching the movement of the wave and the resulting displacement at point P. He details the constant velocity of the wave, the peak reached at the third second, and the subsequent drop in displacement by the fourth second. The summary includes the overlapping of the pulses and the resultant shape of the string at the fifth second, emphasizing the cancellation of slopes and the final linear movement.
🏆 Scoring Guide and Conclusion
Alan concludes the video by reviewing the scoring guide for the wave question, ensuring that the solution provided aligns with the expected outcome. He confirms that the solution is correct by comparing it with the scoring guide's reference picture, which shows the displacement from two units over to minus three. Alan wraps up by expressing hope that viewers found the analysis helpful and encourages them to leave comments, like, or subscribe for more physics content. He hints at the next video, which will likely cover the 2016 AP Physics 1 free response questions.
Mindmap
Keywords
💡AP Physics 1
💡Free Response Questions
💡Wave Pulses
💡Velocity
💡Time
💡Point P
💡Wave Superposition
💡Slope
💡Constant Velocity
💡Linear Rate
💡Scoring Guide
Highlights
Alan from Bothell STEM Coach continues the AP Physics 1 2017 free response questions.
The last question, number four, had a tricky mistake, but overall the questions were manageable.
Question 5 involves wave pulses traveling in opposite directions on a string.
The string's shape at T=0 is described, with pulses moving at a speed of one unit per second.
The task is to plot the velocity of the piece of string at Point P from T=0 to T=5 seconds.
At T=1 second, Point P has not moved.
A sketch is provided to visualize the movement of the string and Point P over time.
The velocity of Point P is expected to be constant, moving at one centimeter per second.
The movement of Point P is described as linear, reaching a peak and then dropping.
By the fourth second, Point P has dropped two centimeters in one second.
At T=5 seconds, the pulses completely overlap, and the string's shape is sketched.
The overlapping of the waves results in the cancellation of slopes, leading to a unique shape of the string.
The final shape of the string at T=5 seconds is described in detail.
The process of numerically adding points to determine the string's shape is explained.
The scoring guide is mentioned, indicating a successful understanding and solution to the problem.
Alan hopes the viewers found the 2017 AP Physics 1 free response questions helpful.
The video concludes with an invitation for comments, likes, subscriptions, and a teaser for the next video.
Transcripts
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