{"id":4333,"date":"2023-02-05T06:26:31","date_gmt":"2023-02-05T06:26:31","guid":{"rendered":"https:\/\/9thclass.deltapublications.in\/?page_id=4333"},"modified":"2024-12-13T07:37:50","modified_gmt":"2024-12-13T07:37:50","slug":"s-16-a-first-law-of-motion","status":"publish","type":"page","link":"https:\/\/9thclass.deltapublications.in\/index.php\/s-16-a-first-law-of-motion\/","title":{"rendered":"S-16.a First Law Of Motion"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong>First Law Of Motion<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"First Law of Motion | Class 9 | Delta Publications\" width=\"620\" height=\"349\" src=\"https:\/\/www.youtube.com\/embed\/8DYrJZRaa6g?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>\n<\/div><\/figure>\n\n\n\n<p class=\"has-text-color has-huge-font-size\" style=\"color:#74008b\">Key notes :<\/p>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-5e2c12f09e7ccaa833290b8a46aac292\" style=\"color:#000060\"><strong>Definition of the First Law of Motion<\/strong>:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"655\" height=\"517\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image.png\" alt=\"\" class=\"wp-image-16259\" style=\"width:364px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image.png 655w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-300x237.png 300w\" sizes=\"auto, (max-width: 655px) 100vw, 655px\" \/><\/figure><\/div>\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>The First Law of Motion, also known as the Law of Inertia, states:<em>An object remains in its state of rest or uniform motion in a straight line unless acted upon by an external unbalanced force.<\/em><\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-3caf38ecd5939a5b7ea19e0057f3c746\" style=\"color:#000060\"><strong>Inertia<\/strong>:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"667\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-1.png\" alt=\"\" class=\"wp-image-16261\" style=\"width:375px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-1.png 800w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-1-300x250.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-1-768x640.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure><\/div>\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li><strong>Inertia<\/strong> is the natural tendency of an object to resist changes in its state of motion or rest.<\/li>\n\n\n\n<li>The greater the mass of an object, the greater its inertia.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-af8f3b08f9c56c3111137419c958aa5c\" style=\"color:#000060\"><strong>Key Components of the Law<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li><strong>Rest<\/strong>: If an object is at rest, it will remain at rest unless an external force acts on it.<\/li>\n\n\n\n<li><strong>Uniform Motion<\/strong>: If an object is moving with constant velocity, it will continue to do so unless an unbalanced force changes its motion.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-b2910f682c72511303afa10fe7d781ba\" style=\"color:#000060\"><strong>Balanced and Unbalanced Forces<\/strong>:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"512\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-3.png\" alt=\"\" class=\"wp-image-16263\" style=\"width:500px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-3.png 1024w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-3-300x150.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-3-768x384.png 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li><strong>Balanced Forces<\/strong>: Do not change the state of motion; the object remains at rest or in uniform motion.<\/li>\n\n\n\n<li><strong>Unbalanced Forces<\/strong>: Cause a change in the state of motion (e.g., start moving, stop moving, or change direction).<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-90b1cc00c5a8a305306662d19b8f432d\" style=\"color:#000060\"><strong>Examples of the First Law in Daily Life<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>A book lying on a table remains at rest until pushed.<\/li>\n\n\n\n<li>A moving car continues to move unless brakes are applied (external force).<\/li>\n\n\n\n<li>Passengers in a moving bus lurch forward when the bus suddenly stops because their bodies tend to maintain their state of motion.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-7714fb11d9e356b8e347088f60beabd9\" style=\"color:#000060\"><strong>Significance of the First Law<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>Explains why seat belts are necessary in vehicles (to counteract inertia in case of sudden stops).<\/li>\n\n\n\n<li>Forms the foundation for understanding motion and force relationships in physics.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-c9a5d1a4d63dbfde7ab9f8f0e2ceb622\" style=\"color:#000060\"><strong>Applications<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>Rocket propulsion: A rocket remains stationary until an unbalanced force (thrust) propels it.<\/li>\n\n\n\n<li>Sports: A football at rest moves when kicked (external force applied).<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-7c4d83091054b917e7c0bcde0decf02c\" style=\"color:#000060\"><strong>Experiment to Understand the Law<\/strong>:<\/p>\n\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>Place a card on a glass and balance a coin on top of the card.<\/li>\n\n\n\n<li>Flick the card horizontally. The coin falls into the glass due to inertia, demonstrating that it resists the horizontal motion of the card.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-link-color has-large-font-size wp-elements-ee1a34bfcfbe154e00c7075322340184\" style=\"color:#000060\"><strong>Historical Background<\/strong>:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-4.png\" alt=\"\" class=\"wp-image-16265\" style=\"width:244px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-4.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-4-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-4-150x150.png 150w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2024\/12\/image-4-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/figure><\/div>\n\n\n<ul class=\"has-large-font-size wp-block-list\">\n<li>Proposed by <strong>Sir Isaac Newton<\/strong> in his work <em>Philosophi\u00e6 Naturalis Principia Mathematica<\/em> (1687).<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#d90000\"><strong>Let&#8217;s practice!<\/strong><\/p>\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\/82528\/337\/597\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-68.png\" alt=\"\" class=\"wp-image-6545\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-68.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-68-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-68-150x150.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\/61990\/608\/764\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-71.png\" alt=\"\" class=\"wp-image-6546\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-71.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-71-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-71-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>First Law Of Motion Key notes : Definition of the First Law of Motion: Inertia: Key Components of the Law: Balanced and Unbalanced Forces: Examples of the First Law in Daily Life: Significance of the First Law: Applications: Experiment to Understand the Law: Historical Background: 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-4333","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/4333","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=4333"}],"version-history":[{"count":32,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/4333\/revisions"}],"predecessor-version":[{"id":16270,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/4333\/revisions\/16270"}],"wp:attachment":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=4333"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}