{"id":633,"date":"2020-10-05T02:30:57","date_gmt":"2020-10-04T21:00:57","guid":{"rendered":"http:\/\/physicscatalyst.com\/article\/?p=633"},"modified":"2022-11-04T12:06:28","modified_gmt":"2022-11-04T06:36:28","slug":"free-body-diagrams","status":"publish","type":"post","link":"https:\/\/physicscatalyst.com\/article\/free-body-diagrams\/","title":{"rendered":"What Are Free Body Diagrams"},"content":{"rendered":"\n<p>In this article, I would discuss what are free body diagrams in physics and how to make one. Free body diagrams are of immense importance when one wants to study physics. You will find a great deal of their usage while studying mechanics and they have equal importance when it comes to other branches of physics. However, I will discuss their usage and construction in context to mechanics.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Free body diagrams definition<\/h2>\n\n\n\n<p>A free-body diagram is a sketch of the body of interest and the forces acting on the body. With the help of a free body diagram, you can precisely define the body(or object under consideration) to which you are applying mechanical equations and the forces that are needed to be considered. So drawing a free body diagram makes it easier for us to understand the forces, torques, or moments and apart from that, it gives you a view of how to apply the proper concepts in order to solve your problem.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Some of the properties and features of free body diagrams are as given below<\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li>Free body&nbsp;diagram&nbsp;is the picture of body on which you would like to apply the balance of forces and such a diagram is&nbsp;isolated&nbsp;from its environment which means that we do not draw the things near the body or object under consideration. As an example free body&nbsp;diagram&nbsp;on a ramp is given below in the figure<\/li><\/ol>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><a href=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2012\/04\/fbd.png\"><img loading=\"lazy\" decoding=\"async\" width=\"679\" height=\"269\" src=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2012\/04\/fbd.png\" alt=\"Free Body Diagrams\" class=\"wp-image-634\" title=\"fbd\" srcset=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2012\/04\/fbd.png 679w, https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2012\/04\/fbd-300x118.png 300w\" sizes=\"auto, (max-width: 679px) 100vw, 679px\" \/><\/a><\/figure><\/div>\n\n\n\n<ol class=\"wp-block-list\"><li>A body in free body diagram may be subsystem of the overall system of interest.<\/li><li>The forces and moments are shown in a free body diagram at the point where they are applied.<\/li><li>Try to draw the contact forces outside the sketch of the system for viewing clarity.<\/li><li>Free body diagrams shows all external forces acting on the body and they do not show any internal forces.<\/li><li>Free body diagrams shows nothings about the motion of the system.<\/li><\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">How to draw a free body&nbsp;diagram<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>First create a mental picture of the body for which you want to write momentum balance equation.<\/li><li>Draw rough sketch of your system showing it to be isolated from its environment.<\/li><li>Place a dot in the center of the object and at this point all the forces are assumed to be acting upon.<\/li><li>For every force acting on that body , <a href=\"https:\/\/physicscatalyst.com\/mech\/vectors-in-physics.php\"  rel=\"noopener noreferrer\">draw a vector<\/a> which shows size and direction of the force. each vector should start at the dot as show in the figure given above.<\/li><li>Label each vector based on the type of force and remember not to include numbers and calculations.<\/li><li>There are some common forces acting on an object that you should always keep in mind and they are<br>(a) $F_{g}=mg $, which is the force due to gravity<br>(b) $F_{a}$ , which is the force applied on the body<br>(c) $F_{f}$ , which is the <a href=\"https:\/\/physicscatalyst.com\/mech\/force-of-friction.php\"  rel=\"noopener noreferrer\">force due to friction<\/a><br>(d) T is the force of tension<\/li><\/ul>\n\n\n\n<p>(e) N is the normal force<\/p>\n\n\n\n<p>(f) $F_{net}$ is the net force in the system<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>If the body is at equilibrium, Net&nbsp; forces acting on the body should be zero . If it is moving, the net force is equal to $ma$ where m is the mass of the body and a is the <a href=\"https:\/\/physicscatalyst.com\/article\/acceleration-formula\/\"  rel=\"noopener noreferrer\">acceleration<\/a> of the body<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Examples on Free Body Diagrams<\/h2>\n\n\n\n<p>(1) Book on a table<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-of-book-in-table.png\"><img loading=\"lazy\" decoding=\"async\" width=\"210\" height=\"168\" src=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-of-book-in-table.png\" alt=\"Free body diagram of book resting on table\" class=\"wp-image-4995\"\/><\/a><\/figure>\n\n\n\n<p>mg -&gt; Weight of the book<\/p>\n\n\n\n<p>R -&gt; Contact force between table and book<\/p>\n\n\n\n<p>(2) Free body diagram for an object slowing down with friction on a horizontal floor<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-of-object-slowing-down-with-friction.png\"><img loading=\"lazy\" decoding=\"async\" width=\"322\" height=\"201\" src=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-of-object-slowing-down-with-friction.png\" alt=\"\" class=\"wp-image-4996\" srcset=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-of-object-slowing-down-with-friction.png 322w, https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-of-object-slowing-down-with-friction-300x187.png 300w\" sizes=\"auto, (max-width: 322px) 100vw, 322px\" \/><\/a><\/figure>\n\n\n\n<p>mg -&gt; Weight of the book<\/p>\n\n\n\n<p>R -&gt; Contact force between table and book<\/p>\n\n\n\n<p>f -&gt; <a href=\"https:\/\/physicscatalyst.com\/mech\/force-of-friction.php\"  rel=\"noopener noreferrer\">Friction force<\/a> between the object and horizontal floor<\/p>\n\n\n\n<p>(3) A set of blocks tied together by a string is being pulled by a force<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-example.png\"><img loading=\"lazy\" decoding=\"async\" width=\"371\" height=\"97\" src=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-example.png\" alt=\"\" class=\"wp-image-4997\" srcset=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-example.png 371w, https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-example-300x78.png 300w\" sizes=\"auto, (max-width: 371px) 100vw, 371px\" \/><\/a><\/figure>\n\n\n\n<p>Let T be the tension in the string, then free body diagrams of the blocks will be<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-1.png\"><img loading=\"lazy\" decoding=\"async\" width=\"136\" height=\"171\" src=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-1.png\" alt=\"\" class=\"wp-image-4998\"\/><\/a><\/figure>\n\n\n\n<p>R<sub>1<\/sub> -&gt; Contact force or Normal Force between block m<sub>1<\/sub> and horizontal floor<\/p>\n\n\n\n<p>m<sub>1<\/sub>g -&gt; Weight of the block<\/p>\n\n\n\n<p>T&nbsp; -&gt; Tension of the string<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-2.png\"><img loading=\"lazy\" decoding=\"async\" width=\"179\" height=\"190\" src=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-2.png\" alt=\"\" class=\"wp-image-4999\"\/><\/a><\/figure>\n\n\n\n<p>R<sub>2<\/sub> -&gt; Contact force or Normal Force between block m<sub>2<\/sub> and horizontal floor<\/p>\n\n\n\n<p>m<sub>2<\/sub>g -&gt; Weight of the block<\/p>\n\n\n\n<p>T&nbsp; -&gt; Tension of the string<\/p>\n\n\n\n<p>F&nbsp; -&gt; Force applied on the body<\/p>\n\n\n\n<p>(4) Free body diagram of <a href=\"https:\/\/physicscatalyst.com\/article\/atwood-machine\/\"  rel=\"noopener noreferrer\">Atwood Machine<\/a><\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-3.png\"><img loading=\"lazy\" decoding=\"async\" width=\"332\" height=\"321\" src=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-3.png\" alt=\"\" class=\"wp-image-5000\" srcset=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-3.png 332w, https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-3-300x290.png 300w\" sizes=\"auto, (max-width: 332px) 100vw, 332px\" \/><\/a><\/figure>\n\n\n\n<p>Let T be the tension in the string, then free body diagram of both the blocks will be<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-4.png\"><img loading=\"lazy\" decoding=\"async\" width=\"332\" height=\"321\" src=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-4.png\" alt=\"\" class=\"wp-image-5001\" srcset=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-4.png 332w, https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-4-300x290.png 300w\" sizes=\"auto, (max-width: 332px) 100vw, 332px\" \/><\/a><\/figure>\n\n\n\n<p>Here we have learned about free body diagrams and how to draw one. So you can use this knowledge for solving problems in physics.<\/p>\n\n\n\n<p><span style=\"text-decoration: underline;\"><strong>A quick video about Free body diagram<\/strong><\/span><\/p>\n\n\n<p><iframe loading=\"lazy\" title=\"What is Free body diagrams (FBD) | Physics  Force\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/60TwfnSwDKc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Practice Problems<\/h2>\n\n\n\n<ol class=\"wp-block-list\"><li>Draw the free body for the object hanging from ceiling as shown below<\/li><\/ol>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-5.png\"><img loading=\"lazy\" decoding=\"async\" width=\"332\" height=\"321\" src=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-5.png\" alt=\"\" class=\"wp-image-5002\" srcset=\"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-5.png 332w, https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2018\/04\/free-body-diagram-5-300x290.png 300w\" sizes=\"auto, (max-width: 332px) 100vw, 332px\" \/><\/a><\/figure>\n\n\n\n<p>2.\u00a0 A person in an elevator moving up with acceleration a<\/p>\n\n\n\n<p>3\u00a0 A stone is thrown upward with some velocity.<\/p>\n\n\n\n<p><strong>Related Articles<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/physicscatalyst.com\/article\/fictitous-force-and-free-falling-elevator\/\">Fictitious Force and Free falling Elevator<\/a><br><a href=\"https:\/\/physicscatalyst.com\/article\/newtons-third-law-of-motion\/\"  rel=\"noopener noreferrer\">Newton\u2019s Third Law of motion (action-reaction and examples)<\/a><br><a href=\"https:\/\/physicscatalyst.com\/article\/solving-physics-problems\/\"  rel=\"noopener noreferrer\">Solving physics problems<\/a><br><a href=\"https:\/\/physicscatalyst.com\/article\/solve-newtons-law-problems\/\"  rel=\"noopener noreferrer\">How to solve Newton\u2019s Law problems<\/a><br><a href=\"https:\/\/physicscatalyst.com\/article\/solve-problems-body-static-equilibrium\/\"  rel=\"noopener noreferrer\">How to solve problems with Body in Static equilibrium<\/a><br><a href=\"https:\/\/physicscatalyst.com\/article\/different-type-of-forces-and-their-origin\/\"  rel=\"noopener noreferrer\">Different types of Forces and their origin<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this article I would discuss what are free body diagrams and how to make one. Free body digrams are of immense importance when one want to study physics. You will find great deal of their usage while studying mechanics and tou can hey have equal inportance when it comes to other branches of physics. However i will discuss their usage and construction in context to mechanics.<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[14],"tags":[],"class_list":["post-633","post","type-post","status-publish","format-standard","hentry","category-physics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Free Body Diagrams : Definition, Concepts, Examples, Practice Problems<\/title>\n<meta name=\"description\" content=\"Free body diagrams Definition, example. 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How to sketch the free body diagrams, how to represent forces on the body using it","breadcrumb":{"@id":"https:\/\/physicscatalyst.com\/article\/free-body-diagrams\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/physicscatalyst.com\/article\/free-body-diagrams\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/physicscatalyst.com\/article\/free-body-diagrams\/#primaryimage","url":"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2012\/04\/fbd.png","contentUrl":"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2012\/04\/fbd.png","width":"679","height":"269","caption":"free body digram figure"},{"@type":"BreadcrumbList","@id":"https:\/\/physicscatalyst.com\/article\/free-body-diagrams\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/physicscatalyst.com\/article\/"},{"@type":"ListItem","position":2,"name":"Physics","item":"https:\/\/physicscatalyst.com\/article\/physics\/"},{"@type":"ListItem","position":3,"name":"What Are Free Body Diagrams"}]},{"@type":"WebSite","@id":"https:\/\/physicscatalyst.com\/article\/#website","url":"https:\/\/physicscatalyst.com\/article\/","name":"physicscatalyst's Blog","description":"Learn free for class 9th, 10th science\/maths , 12th and IIT-JEE Physics and maths.","publisher":{"@id":"https:\/\/physicscatalyst.com\/article\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/physicscatalyst.com\/article\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/physicscatalyst.com\/article\/#organization","name":"physicscatalyst","url":"https:\/\/physicscatalyst.com\/article\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/physicscatalyst.com\/article\/#\/schema\/logo\/image\/","url":"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2024\/08\/cropped-logo-1.jpg","contentUrl":"https:\/\/physicscatalyst.com\/article\/wp-content\/uploads\/2024\/08\/cropped-logo-1.jpg","width":96,"height":96,"caption":"physicscatalyst"},"image":{"@id":"https:\/\/physicscatalyst.com\/article\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/PhysicsCatalyst","https:\/\/x.com\/physicscatalyst","https:\/\/www.youtube.com\/user\/thephysicscatalyst","https:\/\/www.instagram.com\/physicscatalyst\/"]},{"@type":"Person","@id":"https:\/\/physicscatalyst.com\/article\/#\/schema\/person\/9b302efdc9b32e459cb1e61ab7506d3f","name":"physicscatalyst","sameAs":["https:\/\/physicscatalyst.com","https:\/\/www.facebook.com\/PhysicsCatalyst","https:\/\/x.com\/physicscatalyst"]}]}},"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"shareaholic-thumbnail":false},"uagb_author_info":{"display_name":"physicscatalyst","author_link":"https:\/\/physicscatalyst.com\/article\/author\/physicscatalyst\/"},"uagb_comment_info":1,"uagb_excerpt":"In this article I would discuss what are free body diagrams and how to make one. Free body digrams are of immense importance when one want to study physics. You will find great deal of their usage while studying mechanics and tou can hey have equal inportance when it comes to other branches of physics.&hellip;","_links":{"self":[{"href":"https:\/\/physicscatalyst.com\/article\/wp-json\/wp\/v2\/posts\/633","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/physicscatalyst.com\/article\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/physicscatalyst.com\/article\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/physicscatalyst.com\/article\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/physicscatalyst.com\/article\/wp-json\/wp\/v2\/comments?post=633"}],"version-history":[{"count":2,"href":"https:\/\/physicscatalyst.com\/article\/wp-json\/wp\/v2\/posts\/633\/revisions"}],"predecessor-version":[{"id":6794,"href":"https:\/\/physicscatalyst.com\/article\/wp-json\/wp\/v2\/posts\/633\/revisions\/6794"}],"wp:attachment":[{"href":"https:\/\/physicscatalyst.com\/article\/wp-json\/wp\/v2\/media?parent=633"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/physicscatalyst.com\/article\/wp-json\/wp\/v2\/categories?post=633"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/physicscatalyst.com\/article\/wp-json\/wp\/v2\/tags?post=633"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}