[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-665516-105":59,"doc-detail-665516-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","forces-and-newtons-laws-chapter-3-free-body-diagrams","Forces and Newton’s Laws - Chapter 3 - Free-Body Diagrams","","Explains how gravity acts after an object leaves the ground and why force analysis often requires free-body diagrams. Defines free-body diagrams as arrow-based representations of external forces with direction and magnitude. Walks through examples: an object at rest in space, a book at rest on a tabletop, and a box at rest under horizontal pull balanced by static friction, concluding with the net-force condition. Connects free-body diagrams to motion diagrams for a falling ball, assuming air resistance is negligible.",{"@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":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/forces-and-newtons-laws-chapter-3-free-body-diagrams/665516/",{"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/forces-and-newtons-laws-chapter-3-free-body-diagrams/665516.png","ImageObject",300,407,{"name":92,"@type":93},"RuangKosong","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-29",true,{"@type":102,"interactionType":103,"userInteractionCount":8},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is the primary force acting on you after you leave the ground?","Question",{"text":112,"@type":113},"Gravity is the primary force. You are attracted toward Earth by the force of gravity even without contact.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What does a free-body diagram represent and how should arrows be drawn?",{"text":117,"@type":113},"It shows external forces on an object using arrows. Arrow direction matches the force direction, and arrow length is proportional to force magnitude, with each arrow labeled by an appropriate symbol.",{"name":119,"@type":110,"acceptedAnswer":120},"Why does an object at rest on a tabletop remain at rest in the book and box examples?",{"text":121,"@type":113},"In each rest case, the net force is zero because forces cancel exactly. For the box, static friction balances the applied horizontal pull as long as the pull is small enough.","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},665516,1793304641,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":8,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":14,"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":129,"read_time":24},962090883219,"https://ap-avatar.wpscdn.com/davatar_276721f389ce27ea32af1340a28f341c","Answer to Essential Question 3.1: The primary force acting on you once you have left the ground is the force of gravity. You are attracted toward the Earth by the force of gravity eventhough you are not in contact with the Earth.  \n3-2 Free-Body Diagrams  \nWhen analyzing a particular physical situation, it can be helpful to draw what is called a free-body diagram. This is a diagram in which arrows are attached to an object to represent the various forces applied to that object by external influences. The direction of an arrow is the same as the direction of the force the arrow represents, and the length of the arrow is proportional to the magnitude of that force. Each arrow is labeled with an appropriate symbol denoting the force the arrow represents.  \nWhen drawing a free-body diagram, it is helpful to keep two questions in mind:  \n1. For each force shown on the free-body diagram, what exerts the force?  \n2. Is the motion that would result from the set of forces acting on the object consistent with the actual motion of the object?  \nThe following Explorations should help us learn how to answer those questions.  \nEXPLORATION 3.2A– Drawing a free-body diagram for an object at rest  \nStep 1 – Sketch a free-body diagram for an object that is at rest in outer space, billions of kilometers away from anything. The free-body diagram in Figure 3.3 shows no forces, since the object does not interact with anything.  \nFigure 3.3: Free-body diagram for an object that is not interacting with anything.  \nStep 2-Sketch a free-body diagram for a book is at rest on a horizontal tabletop. The free-body diagram for this very common situation is shown in Figure 3.4. The Earth applies a downward force of gravity to the book, but the book remains at rest because there is an upward normal force applied to the book by the table. How do you think the magnitudes of these two forces compare? For the book to remain at rest, these two forces must cancel one another exactly, so the two forces have the same magnitude.  \nFigure 3.4: Free-body diagram for a book sitting at rest on a table.  \nStep 3-Sketch a free-body diagram for a box that remains at rest on a horizontal tabletop even though you exert a horizontal force by pulling on a string tied to the box. The force you exert is transferred to the box by the string, so it is shown as a force of tension in Figure 3.5. When drawing the free-body diagram consider this question: Why doesn’t the box move? If you pull hard enough, the box will move. In this case, though, the force you exert on the box is small enough that it can be balanced by another force in the opposite direction. This balancing force is the force of static friction, which we discuss in detail in chapter 5. Because the box does not move horizontally these two forces must cancel one another, so their magnitudes are equal.  \nAs in step 2 the Earth applies a downward force of gravity to the box that is exactly balanced by the upward normal force applied to the box by the table.  \nFigure 3.5: Free-body diagram for a box at reston a table while you pull on a string to the right.  \nChapter 3 – Forces and Newton’s Laws Page 3-4  \nStep 4 – What, if anything, is common to the three situations discussed above? First, in each case, the object remains at rest – its motion does not change. Second, although the three free-body diagrams clearly are different, in each case there is no net force acting on the object. The net force is the sum of all the forces acting on an object. Because forces are vectors, we must account for both the directions and magnitudes of forces when we add them. There is no net force in any of the cases above because either there is no force acting at all or all the forces cancel out. Based on this, let’s theorize that when no net force acts on an object that is at rest, the object remains at rest.  \nKey ideas for an object at rest: The net force is the vector sum of all the forces acting on an object. When no net force acts on an o","cbCaihJUjMm2SWPB","https://ap.wps.com/l/cbCaihJUjMm2SWPB","pdf",127865,"English","# Free-body diagrams\n## Primary force after leaving the ground: gravity\n## Drawing a free-body diagram\n## Object at rest in space\n## Book at rest on a tabletop\n## Box at rest under horizontal pull and static friction\n## Net force and the condition for rest\n## Motion diagram vs. free-body diagram for a falling ball","[{\"question\":\"What is the primary force acting on you after you leave the ground?\",\"answer\":\"Gravity is the primary force. You are attracted toward Earth by the force of gravity even without contact.\"},{\"question\":\"What does a free-body diagram represent and how should arrows be drawn?\",\"answer\":\"It shows external forces on an object using arrows. Arrow direction matches the force direction, and arrow length is proportional to force magnitude, with each arrow labeled by an appropriate symbol.\"},{\"question\":\"Why does an object at rest on a tabletop remain at rest in the book and box examples?\",\"answer\":\"In each rest case, the net force is zero because forces cancel exactly. For the box, static friction balances the applied horizontal pull as long as the pull is small enough.\"}]","Forces and Newton’s Laws - Chapter 3 - Free-Body Diagrams | PDF"]