{"id":6254,"date":"2020-10-13T15:19:14","date_gmt":"2020-10-13T09:49:14","guid":{"rendered":"http:\/\/astan.lk\/al_virtualclassroom\/?p=6254"},"modified":"2020-10-13T15:19:19","modified_gmt":"2020-10-13T09:49:19","slug":"work-energy-and-power","status":"publish","type":"post","link":"https:\/\/astan.lk\/al_virtualclassroom\/work-energy-and-power\/","title":{"rendered":"Work, Energy and Power"},"content":{"rendered":"<p><span style=\"text-decoration: underline;\">Work<\/span><\/p>\n<p>The word work is used only in those cases where there is a force and a displacement occurs in the \u00a0direction of force.<\/p>\n<p><strong>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Work done = Force acting on the body\u00a0\u00d7 Distance moved in the direction of force<\/strong><\/p>\n<p><strong>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0W = F\u00a0\u00d7 S<\/strong><\/p>\n<p>[W] = ML<sup>2<\/sup>T<sup>-2<\/sup><\/p>\n<p>Unit &#8211; \u00a0kgm<sup>2<\/sup>s<sup>-2<\/sup> = joule<\/p>\n<p><strong>1 J &#8211;\u00a0<\/strong>1 joule is the work done by a force of 1N acting through a distance of 1m in the direction of force.<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/WORK.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7318\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/WORK.png\" alt=\"WORK\" width=\"492\" height=\"203\" \/><\/a><\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/Untitled-3-1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7466 aligncenter\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/Untitled-3-1.png\" alt=\"Untitled-3\" width=\"247\" height=\"110\" \/><\/a><\/p>\n<p><span style=\"text-decoration: underline;\"><strong>Power<\/strong><\/span><\/p>\n<p>Power is the rate of doing work.<\/p>\n<p><strong><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/pw.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7426\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/pw.png\" alt=\"pw\" width=\"235\" height=\"53\" \/><\/a><\/strong><\/p>\n<p>[P]=ML<sup>2<\/sup>T<sup>-3<\/sup><\/p>\n<p>Unit &#8211; kgm<sup>2<\/sup> t<sup>-3<\/sup> =Js<sup>-1<\/sup>\u00a0Watts<\/p>\n<p><strong>\u00a01Watt &#8211;\u00a0<\/strong>Capable of doing work at the rate of 1Js<sup>-1<\/sup> is said to possess a power of 1W<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/p.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7402\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/p.png\" alt=\"p\" width=\"520\" height=\"100\" \/><\/a>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<strong> t=0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 t=t<\/strong><\/p>\n<p>Work done by applied force \u00a0 W=F\u00d7S<\/p>\n<p>Work done by applied force in unit time \u00a0= F\u00d7S\/t<\/p>\n<p><strong>Power=F\u00d7V<\/strong><\/p>\n<h3><span style=\"text-decoration: underline;\">Energy<\/span><\/h3>\n<p>Ability to do work is called energy.<\/p>\n<h4><span style=\"text-decoration: underline;\">Kinetic energy<\/span><\/h4>\n<p>An object has kinectic energy due to its motion.<\/p>\n<h3><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/e.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7434\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/e.png\" alt=\"e\" width=\"376\" height=\"107\" \/><\/a><\/h3>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/Untitled-2-2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7444 alignleft\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/Untitled-2-2.png\" alt=\"Untitled-2\" width=\"82\" height=\"102\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Kinetic Energy =\u00a0\u00bdmv\u00b2<\/strong><\/p>\n<h4><span style=\"text-decoration: underline;\">Gravitational potential energy<\/span><\/h4>\n<p>Gravitational potential energy is a energy due to the position of the object.<\/p>\n<p><strong>Gravitational potential energy= mgh<\/strong><\/p>\n<h4><span style=\"text-decoration: underline;\">Elastic potential energy<\/span><\/h4>\n<p>Elastic potential energy is <a href=\"http:\/\/hyperphysics.phy-astr.gsu.edu\/hbase\/pegrav.html#pe\">Potential energy<\/a> stored as a result of deformation of an elastic object, such as the stretching of a spring. It is equal to the <a href=\"http:\/\/hyperphysics.phy-astr.gsu.edu\/hbase\/wcon.html\">work<\/a> done to stretch the spring, which depends upon the spring constant k as well as the distance stretched. According to <a href=\"http:\/\/hyperphysics.phy-astr.gsu.edu\/hbase\/permot2.html#c3\">Hooke&#8217;s law<\/a>, the <a href=\"http:\/\/hyperphysics.phy-astr.gsu.edu\/hbase\/force.html#defor\">force<\/a>required to stretch the spring will be directly proportional to the amount of stretch.<\/p>\n<table style=\"height: 83px;\" width=\"243\">\n<tbody>\n<tr>\n<td width=\"270\">\n<h2 align=\"center\">F = -kx<\/h2>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>x- extension \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0k-spring constant<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/sprp3.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-7460 alignright\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/sprp3.gif\" alt=\"sprp3\" width=\"270\" height=\"134\" \/><\/a><\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/wr.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7457 alignleft\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/wr.gif\" alt=\"wr\" width=\"193\" height=\"145\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p><strong>Elastic potential energy=\u00bdkx\u00b2 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/strong><strong>=work done \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0=area of the triangle<\/strong><\/p>\n<p>&nbsp;<\/p>\n<h3><span style=\"text-decoration: underline;\">Conservation of mechanical energy<\/span><\/h3>\n<p>Mechanical energy is the sum of the potential and kinetic energies in a system. The principle of the conservation of mechanical energy states that the total mechanical energy in a system (i.e., the sum of the potential plus kinetic energies) remains constant as long as the only forces acting are conservative forces.<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/u5l2b17.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-7468\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/u5l2b17.gif\" alt=\"u5l2b17\" width=\"411\" height=\"288\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Work The word work is used only in those cases where there is a force and a displacement occurs in the \u00a0direction of force. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Work done = Force acting on the body\u00a0\u00d7 Distance moved in the direction of force \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 [&hellip;]<\/p>\n","protected":false},"author":842,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[16,1948],"tags":[],"class_list":["post-6254","post","type-post","status-publish","format-standard","hentry","category-physics","category-unit-02-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Work, Energy and Power - Learning &amp; 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