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Select the best response to each question, and use a No.2 pencil to completely fill the box corresponding to your choice. If you change an answer, completely erase the previous mark. Only use the boxes numbered 1 through 25 on the answer sheet.  \n• All questions are equally weighted, but are not necessarily equally difficult.  \n• You will receive one point for each correct answer, and zero points for each incorrect or blank answer. There is no additional penalty for incorrect answers.  \n• You may use a hand-held calculator. Its memory must be cleared of data and programs. You may use only the basic functions found on a simple scientific calculator. Calculators may not be shared. Cell phones may not be used during the exam or while the exam papers are present. You may not use any external references, such as books or formula sheets.  \n• The question booklet, answer sheet and scratch paper will be collected at the end of this exam.  \n• To maintain exam security, do not communicate any information about the questions or their solutions until after February 13, 2025 .  \nDO NOT OPEN THIS TEST UNTIL YOU ARE TOLD TO BEGIN  \nWe acknowledge The US Physics Team coaches and other contributors to this year’s exams:  \nTengiz Bibilashvili, Kellan Colburn, Natalie LeBaron, Rishab Parthasarathy, Mai Qi, Kye Shi, Heng Yuan, Elena Yudovina and Kevin Zhou  \nCopyright ©2025 American Association of Physics Teachers  \n1. A particle is moving on a plane at a constant speed of 1m/s, but not necessarily in a straight line. Which of the following plot pairs could describe the particle’s position over time, in rectilinear coordinates?  \n10  \n5  \n0  \n−5  \n−10  \n10  \n5  \n0  \n−5  \n−10  \n10  \n5  \n0  \n−5  \n−10  \ny (m) y (m) y (m)  \n10  \n5  \n0  \n−5  \n−10  \n10  \n5  \n0  \n−5  \n−10  \n10  \n5  \n0  \n−5  \n−10  \n(A) I only B  II only  \n(C) III only  \n(D) II and III only  \n(E) All three plots could describe the particle’s position over time  \nAll three plots describe the particle moving at a constant speed. In plot I, the particle is moving in a circle of radius 10m, and traversing the full circle in 10 seconds, so its speed is approximately 63m/s. (The  x component alone gets to 10m in 2.5 seconds.) In plot II, the particle moves at a speed of p (0 .8m/s)2 + (0 .6m/s)2 = 1m/s. In plot III, the particle moves at a speed of p (0 .5m/s)2 + (−0 .5m/s)2 \u003C 1m/s.  \nCopyright ©2025 American Association of Physics Teachers  \nThe following information applies to problems 2 and 3 .  \nThree identical disks are placed on a frictionless table. Initially, two of the disks are at rest and in contact with each other. The third disk is launched with speed v directly toward the midpoint of the two stationary disks along a path perpendicular to the line connecting their centers, as shown in the diagram. Analyze the motion of the disks after the collision, assuming all interactions are perfectly elastic and that when the disks collide, there is no friction or inelastic energy loss.  \n2. Assume that all three disks collide simultaneously. What is the final velocity of the third disk?  \n(A) v/3 in the opposite direction to the initial velocity  \n(B) v/3 in the same direction as the initial velocity (C) ⃗0  \nD  v/5 in the opposite direction to the initial velocity  \n(E) v/5 in the same direction as the initial velocity  \nBy symmetry, the third disk continues to move along the same axis. The first two disks experience only a normal force from the third disk, which is at an angle 30◦ to the third disk’s original velocity. Thus, if the third disk has final velocity vf, and the other two disks have final speed u, conservation of energy gives  \nv 2 = v2f + 2u2  \nand conservation of momentum giv","cbCaif5bg3NKDt1j","https://ap.wps.com/l/cbCaif5bg3NKDt1j","pdf",532539,17,"English","# Instructions\n# Multiple Choice Questions\n## Question 1: Rectilinear position-time plots at constant speed\n## Questions 2-3: Elastic collisions of three identical disks\n## Question 4: Cat-and-mouse pursuit acceleration\n## Question 5: Friction with three identical cylinders","[{\"question\":\"What are the test rules for opening and answering the exam?\",\"answer\":\"Do not open the test until instructed to begin. Select the best response for each multiple-choice question and fill the corresponding box using a No.2 pencil; erase completely if you change an answer.\"},{\"question\":\"What are the calculator and reference restrictions during the exam?\",\"answer\":\"You may use a hand-held calculator only with cleared memory and only basic functions on a simple scientific calculator. Calculators may not be shared, and no external references such as books or formula sheets are allowed.\"},{\"question\":\"When is it allowed to communicate information about the questions or solutions?\",\"answer\":\"To maintain exam security, do not communicate any information about the questions or their solutions until after February 13, 2025.\"}]","2025 F - ma Exam - 25 Questions - 75 Minutes | PDF",1789902220,43]