{"id":3723,"date":"2023-01-09T10:22:33","date_gmt":"2023-01-09T10:22:33","guid":{"rendered":"https:\/\/9thclass.deltapublications.in\/?page_id=3723"},"modified":"2024-11-22T06:57:11","modified_gmt":"2024-11-22T06:57:11","slug":"s-11-a-work","status":"publish","type":"page","link":"https:\/\/9thclass.deltapublications.in\/index.php\/s-11-a-work\/","title":{"rendered":"S-11.a Work"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong>Work<\/strong><\/h2>\n\n\n<div class=\"wp-block-image is-resized\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"535\" height=\"278\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/09\/image-48.png\" alt=\"\" class=\"wp-image-10270\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/09\/image-48.png 535w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/09\/image-48-300x156.png 300w\" sizes=\"auto, (max-width: 535px) 100vw, 535px\" \/><\/figure><\/div>\n\n\n<p class=\"has-text-color has-huge-font-size\" style=\"color:#74008b\"><strong>Key Notes:<\/strong><\/p>\n\n\n\n<div class=\"wp-block-group has-large-font-size\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<p><strong>Definition of Work:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In physics, work is defined as the product of force and displacement in the direction of the force applied.<\/li>\n\n\n\n<li>Mathematically, work (W) is expressed as W = F * d, where W is work, F is force, and d is displacement.<\/li>\n<\/ul>\n\n\n\n<p><strong>Units of Work:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The standard unit for work is the joule (J), which is equivalent to one newton-meter (N\u00b7m).<\/li>\n<\/ul>\n\n\n\n<p><strong>Positive and Negative Work:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>When the force applied and the displacement are in the same direction, work is positive.<\/li>\n\n\n\n<li>When the force and displacement are in opposite directions, work is negative.<\/li>\n<\/ul>\n\n\n\n<p><strong>Zero Work:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If there is no displacement or if the force and displacement are perpendicular, then the work done is zero.<\/li>\n<\/ul>\n\n\n\n<p><strong>Work and Energy:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Work done on an object is the transfer of energy to that object.<\/li>\n\n\n\n<li>The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy: W = \u0394KE.<\/li>\n<\/ul>\n\n\n\n<p><strong>Simple Machines and Work:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Simple machines like levers, pulleys, and inclined planes make it easier to do work by changing the direction or magnitude of the applied force.<\/li>\n<\/ul>\n\n\n\n<p><strong>Mechanical Advantage:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mechanical advantage is a measure of how much a machine multiplies force or changes its direction.<\/li>\n\n\n\n<li>Mechanical advantage (MA) = Output Force (OF) \/ Input Force (IF).<\/li>\n<\/ul>\n\n\n\n<p><strong>Efficiency:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Efficiency is a measure of how well a machine converts the input energy into useful work output.<\/li>\n\n\n\n<li>Efficiency = (Useful Work Output \/ Total Work Input) x 100%.<\/li>\n<\/ul>\n\n\n\n<p><strong>Work-Energy Principle:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The work-energy principle states that the work done on an object equals the change in its mechanical energy.<\/li>\n\n\n\n<li>Mechanical energy = Kinetic Energy + Potential Energy.<\/li>\n<\/ul>\n\n\n\n<p><strong>Power:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Power is the rate at which work is done or the rate at which energy is transferred or converted.<\/li>\n\n\n\n<li>Power (P) = Work (W) \/ Time (t), and the unit of power is the watt (W).<\/li>\n<\/ul>\n\n\n\n<p><strong>Human and Machine Work:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Machines are designed to help humans do work more efficiently and with less effort.<\/li>\n\n\n\n<li>Understanding the concept of work is essential in the design and use of machines.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color\" style=\"color:#d90000\">Let&#8217;s practice!<\/p>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/82463\/057\/737\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-49.png\" alt=\"\" class=\"wp-image-6487\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-49.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-49-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-49-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/81561\/421\/904\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-52.png\" alt=\"\" class=\"wp-image-6488\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-52.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-52-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-52-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Work Key Notes: Definition of Work: Units of Work: Positive and Negative Work: Zero Work: Work and Energy: Simple Machines and Work: Mechanical Advantage: Efficiency: Work-Energy Principle: Power: Human and Machine Work: Let&#8217;s practice!<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-3723","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3723","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/comments?post=3723"}],"version-history":[{"count":11,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3723\/revisions"}],"predecessor-version":[{"id":15927,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3723\/revisions\/15927"}],"wp:attachment":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=3723"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}