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The report highlights typical performance trends such as successful graphing choices, frequent errors like abrupt velocity drops at specific times, and gaps in reasoning about center-of-mass motion, friction-induced torque, and changes in angular momentum.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":20,"@type":76,"position":81},"https://docshare.wps.com/document/exam/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/chief-reader-report-on-student-responses-2019-ap-physics-1-free-response-questions/314580/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/chief-reader-report-on-student-responses-2019-ap-physics-1-free-response-questions/314580.png","ImageObject",300,407,{"name":92,"@type":93},"McQueen","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-29","2026-09-20",true,{"@type":102,"interactionType":103,"userInteractionCount":52},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What does Question #1 expect students to demonstrate in AP® Physics 1?","Question",{"text":112,"@type":113},"Students must show understanding of the center of mass for a two-object system and rotational motion for sliding or rolling objects. They must also connect constant force to linear velocity changes over time and demonstrate correct graphing data. Finally, they should reason that a net torque changes angular momentum, with friction producing torque while forces directed toward the center do not.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How did students generally perform on the graphing component of Question #1?",{"text":117,"@type":113},"Students generally performed well in graphing center-of-mass speed. Many recognized the initial linear increase, the constant speed without friction, and the linear decrease with friction, often drawing a single qualitatively accurate graph. A common error was incorrectly including an abrupt decrease in velocity at a specific time labeled tE.",{"name":119,"@type":110,"acceptedAnswer":120},"What misconceptions about torque and angular momentum were common?",{"text":121,"@type":113},"Many students did not clearly connect friction to torque that changes angular momentum. Even when they selected the correct segment (C to D), they often answered using only linear quantities and claimed friction reduced speed, rather than reasoning about torque. Less commonly, students assumed the sphere stopped rolling and angular momentum became zero when torque was no longer present, or claimed the plunger force produced a change in angular momentum.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},314580,1789962482,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":19,"category_name":20,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":52,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":56,"language":139,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":140,"faqs":141,"seo_title":142,"seo_description":67,"update_tm":143,"read_time":144,"preview_page_count":4},5909890329169,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","Chief Reader Report on Student Responses: 2019 AP® Physics 1 Free-Response Questions  \n􀁸 Number of Students Scored  \n􀁸 Number of Readers  \n􀁸 Score Distribution  \n􀁸 Global Mean  \n161,071  \n377 (for all Physics exams)  \nExam Score 5  \n4 3  \n2  \n1  \n2.51  \nN 10,750 29,358 33,063  \n46,160 41,740  \n%At  \n6.7  \n18.2  \n20.5  \n28.7  \n25.9  \nThe following comments on the 2019 free-response questions for AP® Physics 1 were written by the Chief Reader, Shannon Willoughby, Montana State University. They give an overview of each free-response question and of how students performed on the question, including typical student errors. General comments regarding the skills and content that students frequently have the most problems with are included. Some suggestions for improving student preparation in these areas are also provided. Teachers are encouraged to attend a College Board workshop to learn strategies for improving student performance in specific areas.  \n© 2019 The College Board. Visit the College Board on the web: [collegeboard.org](collegeboard.org).  \nQuestion \\#1  \nTask: Other, graphing  \nMax. Points: 7  \nTopic: Kinematics  \nMean Score: 3.49  \nWhat were the responses to this question expected to demonstrate?  \nIn this question, students must demonstrate an understanding of the center of mass of a two-object system and the rotational motion of sliding or rolling objects. To successfully complete the problem, students must:  \n􀁸 Indicate that the velocity of an object on a horizontal surface with negligible friction remains constant.  \n􀁸 Show that the center of mass velocity remains unchanged in a collision.  \n􀁸 Recognize that a constant force leads to a linear change in velocity with time, as occurs both while the sphere is pushed by the plunger and while it slides across a frictional surface.  \n􀁸 Demonstrate skills presenting data in a graph.  \n􀁸 Reason that a net torque leads to a change in angular momentum. Specifically, a tangential force at the surface, such as friction, produces a torque that leads to an increase in angular momentum in this problem, while a force directed towards the center of the sphere, such as the force imposed by the plunger, gravity, or the normal force, does not produce a torque.  \nHow well did the responses address the course content related to this question? How well did the responses integrate the skills required on this question?  \n􀁸 Students generally did well in graphing the center of mass speed, often recognizing the initial linear increase in speed, the constant speed in the absence of friction, and the linear decrease in speed in the presence of friction, as well as drawing a single, qualitatively accurate graph from tA to tF. They frequently incorrectly included an abrupt decrease in velocity at tE.  \n􀁸 Students often recognized segment C to D as a region leading to a change in angular momentum and that angular momentum is associated with whether the sphere is rolling or not. However, students often did not demonstrate understanding that friction causes a torque which leads to a change in angular momentum.  \nWhat common student misconceptions or gaps in knowledge were seen in the responses to this question?  \n􀁸 It was common for students to include an abrupt decrease in velocity at tE on the graph, perhaps considering only the motion of block 1 and not recognizing that the center of mass velocity remains constant when embedded in this multi-step analysis.  \n􀁸 In part (b) students often did not clearly indicate that friction leads to a torque which produces a change in angular momentum. While most students correctly checked “C to D” in their responses, students often attempted to answer the question using only linear quantities, incorrectly stating that friction reduced the speed of the object and therefore decreased angular momentum.  \n􀁸 Less commonly, students incorrectly indicated that the sphere stopped rolling and the angular momentum was zero when a torque is no longer present, such as on","cbCaidp7nqA5S9Go","https://ap.wps.com/l/cbCaidp7nqA5S9Go","pdf",357839,"English","# Question #1\n## Task, topic, and scoring\n## Expected demonstrations\n## Performance vs. course content and skills\n## Common misconceptions and gaps\n## Advice for teachers\n## Recommended resources","[{\"question\":\"What does Question #1 expect students to demonstrate in AP® Physics 1?\",\"answer\":\"Students must show understanding of the center of mass for a two-object system and rotational motion for sliding or rolling objects. They must also connect constant force to linear velocity changes over time and demonstrate correct graphing data. Finally, they should reason that a net torque changes angular momentum, with friction producing torque while forces directed toward the center do not.\"},{\"question\":\"How did students generally perform on the graphing component of Question #1?\",\"answer\":\"Students generally performed well in graphing center-of-mass speed. Many recognized the initial linear increase, the constant speed without friction, and the linear decrease with friction, often drawing a single qualitatively accurate graph. A common error was incorrectly including an abrupt decrease in velocity at a specific time labeled tE.\"},{\"question\":\"What misconceptions about torque and angular momentum were common?\",\"answer\":\"Many students did not clearly connect friction to torque that changes angular momentum. Even when they selected the correct segment (C to D), they often answered using only linear quantities and claimed friction reduced speed, rather than reasoning about torque. Less commonly, students assumed the sphere stopped rolling and angular momentum became zero when torque was no longer present, or claimed the plunger force produced a change in angular momentum.\"}]","Chief Reader Report on Student Responses: 2019 AP® Physics 1 Free-Response Questions | PDF",1789901185,48]