{"id":3131,"date":"2025-07-07T10:01:40","date_gmt":"2025-07-07T10:01:40","guid":{"rendered":"https:\/\/odeacademy.in\/?p=3131"},"modified":"2025-07-30T14:25:40","modified_gmt":"2025-07-30T14:25:40","slug":"work-energy-and-power-2","status":"publish","type":"post","link":"https:\/\/thequickknowledge.com\/exam\/work-energy-and-power-2\/","title":{"rendered":"Work Energy And Power &#8211; Physics | General Science"},"content":{"rendered":"<h5 style=\"text-align: center;\">Work Energy And Power<\/h5>\n<hr \/>\n<ul>\n<li><strong>Work<\/strong> &#8211; when a force is applied to an object and object moves in direction of force.<br \/>\nFormula: Work = Force \u00d7 Distance \u00d7 cos(\u03b8), <strong>Unit<\/strong>: Joules (J)<\/li>\n<li><strong>Energy<\/strong> &#8211; The capacity to do work. There are many forms (kinetic, potential, thermal, etc.).<br \/>\n<strong>Unit<\/strong>: Joules (J)<\/li>\n<li><strong>Power<\/strong> &#8211; The rate at which work is done or energy is transferred.<br \/>\nFormula: Power = Work \/ Time, <strong>Unit<\/strong>: Watts (W)<\/li>\n<\/ul>\n<hr \/>\n<p><strong>Work<\/strong> is said to be done when a force is applied on an object and the object is displaced in the direction of the force. If any of these is missing, <strong data-start=\"553\" data-end=\"572\">no work is done<\/strong> (even if effort is made). Formula for Work,<\/p>\n<ul>\n<li><strong>Work (W) = Force (F) \u00d7 Displacement (s)\u00a0<\/strong><\/li>\n<li>Unit of Work = joule (J) (1 joule = 1 newton \u00d7 1 metre)<\/li>\n<\/ul>\n<p style=\"padding-left: 40px;\"><strong style=\"font-size: 16px;\">Example <\/strong><span style=\"font-size: 16px;\"><strong>:<\/strong> 5 N force, 2 m displacement \u279d Work = 10 J<\/span><\/p>\n<p data-start=\"721\" data-end=\"1119\"><strong data-start=\"721\" data-end=\"731\">Energy<\/strong> is the capacity to do work. It is transferred from one object to another when work is done.<\/p>\n<ul>\n<li data-start=\"721\" data-end=\"1119\"><strong>Unit of energy =<\/strong> <strong data-start=\"937\" data-end=\"950\">joule (J)<\/strong>, and <span class=\"katex\"><span class=\"katex-mathml\">1\u2009kJ=1000\u2009J<\/span><\/span>.<\/li>\n<li data-start=\"721\" data-end=\"1119\">Energy exists in several forms: <strong data-start=\"1029\" data-end=\"1118\">Mechanical Energy (<\/strong>potential + kinetic<strong data-start=\"1029\" data-end=\"1118\">), <\/strong>heat, chemical, electrical, and light energy.<\/li>\n<\/ul>\n<p data-start=\"1121\" data-end=\"1331\"><strong data-start=\"1121\" data-end=\"1139\">Kinetic Energy<\/strong> is the energy possessed by an object due to its motion. A moving object can do work based on its speed. The faster it moves, the more kinetic energy it has. The formula for kinetic energy is: KE = 1\/2 * mv\u00b2<\/p>\n<p style=\"padding-left: 40px;\" data-start=\"1362\" data-end=\"1492\"><strong>Example <\/strong><strong>:<\/strong>\u00a0a 15 kg object moving at 4 m\/s has <span class=\"katex\"><span class=\"katex-mathml\">K.E. = 1\/2\u00d715\u00d74\u00b2=120\u2009J<\/span><\/span>\u00a0of kinetic energy.<\/p>\n<p data-start=\"1494\" data-end=\"1649\">The <strong data-start=\"1498\" data-end=\"1521\">work-energy theorem<\/strong> relates work done to the change in kinetic energy. If an object accelerates from velocity <span class=\"katex\"><span class=\"katex-html\" aria-hidden=\"true\"><span class=\"base\"><span class=\"mord mathnormal\">u<\/span><\/span><\/span><\/span> to <span class=\"katex\"><span class=\"katex-mathml\">v<\/span><\/span>, the work done is: <span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\">W=1\/2*m(v\u00b2\u2212u\u00b2)\u00a0<\/span><\/span><\/span><\/p>\n<p style=\"padding-left: 40px;\" data-start=\"1686\" data-end=\"1866\"><strong style=\"font-size: 16px;\">Example :<\/strong> the work needed to increase the speed of a 1500 kg car from 30 km\/h to 60 km\/h is calculated using kinetic energy difference, resulting in <span class=\"katex\"><span class=\"katex-mathml\">156250\u2009J<\/span><\/span>.<\/p>\n<blockquote>\n<p data-start=\"1868\" data-end=\"2065\"><strong data-start=\"1868\" data-end=\"1892\">James Prescott Joule<\/strong> was a British physicist known for his work in electricity, thermodynamics, and the mechanical equivalent of heat. The unit of energy and work, joule, is named in his honor.<\/p>\n<\/blockquote>\n<p><strong>Potential Energy<\/strong> is the energy possessed by an object due to its position or configuration. The formula for kinetic energy is: PE = mgh<\/p>\n<p style=\"padding-left: 40px;\"><strong style=\"font-size: 16px;\">Example :<\/strong><span style=\"font-size: 16px;\"> 15 kg luggage lifted 1.5 m \u279d Work = \ud835\udc5a \u00d7 \ud835\udc54 \u00d7 \u210e =15\u00d79.8\u00d71.5=220.5J<\/span><\/p>\n<p><strong data-start=\"1546\" data-end=\"1586\"> Law of Conservation of Energy &#8211; <\/strong>Energy can neither be created nor destroyed; it only changes from one form to another. This law states that the total energy before and after transformation remains the same.<\/p>\n<p><strong>Power<\/strong> is defined as the rate of doing work, Formula for Power,<\/p>\n<ul>\n<li><strong>Power = Work done (W)\/ Time Taken (t)<\/strong><\/li>\n<li>Unit of Power: Watt (W) (1 watt=1 joule\/second)<\/li>\n<li><strong>Average Power<\/strong> (Total energy consumed\/ Total time taken) is used when power varies over time.<\/li>\n<\/ul>\n<hr \/>\n<h6><\/h6>\n","protected":false},"excerpt":{"rendered":"<p>Work Energy And Power Work &#8211; when a force is applied to an object and object moves in direction of force. Formula: Work = Force \u00d7 Distance \u00d7 cos(\u03b8), Unit: Joules (J) Energy &#8211; The capacity to do work. There are many forms (kinetic, potential, thermal, etc.). Unit: Joules (J) Power &#8211; The rate at [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","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":"","ast-disable-related-posts":"","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":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","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":[1],"tags":[],"class_list":["post-3131","post","type-post","status-publish","format-standard","hentry","category-new-post"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/thequickknowledge.com\/exam\/wp-json\/wp\/v2\/posts\/3131","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thequickknowledge.com\/exam\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thequickknowledge.com\/exam\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thequickknowledge.com\/exam\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/thequickknowledge.com\/exam\/wp-json\/wp\/v2\/comments?post=3131"}],"version-history":[{"count":18,"href":"https:\/\/thequickknowledge.com\/exam\/wp-json\/wp\/v2\/posts\/3131\/revisions"}],"predecessor-version":[{"id":3594,"href":"https:\/\/thequickknowledge.com\/exam\/wp-json\/wp\/v2\/posts\/3131\/revisions\/3594"}],"wp:attachment":[{"href":"https:\/\/thequickknowledge.com\/exam\/wp-json\/wp\/v2\/media?parent=3131"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thequickknowledge.com\/exam\/wp-json\/wp\/v2\/categories?post=3131"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thequickknowledge.com\/exam\/wp-json\/wp\/v2\/tags?post=3131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}