{"id":3703,"date":"2023-01-09T10:18:23","date_gmt":"2023-01-09T10:18:23","guid":{"rendered":"https:\/\/9thclass.deltapublications.in\/?page_id=3703"},"modified":"2025-08-12T06:51:43","modified_gmt":"2025-08-12T06:51:43","slug":"s-9-d-second-law-of-motion","status":"publish","type":"page","link":"https:\/\/9thclass.deltapublications.in\/index.php\/s-9-d-second-law-of-motion\/","title":{"rendered":"S-9.d Second \u00a0Law Of Motion"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong>Second &nbsp;Law Of Motion<\/strong><\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"705\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/09\/image-30.png\" alt=\"\" class=\"wp-image-10230\" style=\"width:430px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/09\/image-30.png 1024w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/09\/image-30-300x207.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/09\/image-30-768x529.png 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\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 class=\"has-text-color has-link-color has-huge-font-size wp-elements-d4d355b76dd54277399098c306fb7fdd\" style=\"color:#74008b\">key points :<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-375a42ac2ad590425c38937d2edf4761\" style=\"color:#000060\"><strong>Statement of the Second Law of Motion<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The Second Law of Motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. In simple terms, it explains how the speed and direction of an object change when a force is applied to it.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-216ca90e29932a5b68fe09812e29b28a\" style=\"color:#000060\"><strong>Mathematical Expression<\/strong><\/h3>\n\n\n\n<p>The Second Law of Motion can be expressed using the formula: <\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"579\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121055.486-1024x579.png\" alt=\"\" class=\"wp-image-17345\" style=\"width:447px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121055.486-1024x579.png 1024w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121055.486-300x170.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121055.486-768x434.png 768w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121055.486.png 1472w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list\">\n<li>F = ma<\/li>\n\n\n\n<li>Where:<\/li>\n\n\n\n<li>F = net force applied to the object (measured in newtons, N)<\/li>\n\n\n\n<li>m = mass of the object (measured in kilograms, kg)<\/li>\n\n\n\n<li>a = acceleration of the object (measured in meters per second squared, m\/s2m\/s^2m\/s2)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-ea70b49588337455be0663fd8011a461\" style=\"color:#000060\"><strong>Understanding Force, Mass, and Acceleration<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Force (F)<\/strong>: A push or pull that can cause an object to accelerate, measured in newtons (N).<\/li>\n\n\n\n<li><strong>Mass (m)<\/strong>: The amount of matter in an object, measured in kilograms (kg). A heavier object has more mass.<\/li>\n\n\n\n<li><strong>Acceleration (a)<\/strong>: The rate of change of velocity of an object, which means how quickly an object speeds up or slows down.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"579\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121149.781-1024x579.png\" alt=\"\" class=\"wp-image-17346\" style=\"width:492px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121149.781-1024x579.png 1024w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121149.781-300x170.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121149.781-768x434.png 768w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121149.781.png 1472w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-6508419f59e0885e8da0afa639eb039c\" style=\"color:#000060\"><strong>Direct Proportionality of Force and Acceleration<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>When the mass of an object is constant, increasing the force applied to the object will increase its acceleration. For example, pushing a car with more force will make it accelerate faster.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"579\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121338.396-1024x579.png\" alt=\"\" class=\"wp-image-17347\" style=\"width:513px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121338.396-1024x579.png 1024w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121338.396-300x170.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121338.396-768x434.png 768w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121338.396.png 1472w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-523b2a606da8aefa53739f04e2e1fdcb\" style=\"color:#000060\"><strong>Inverse Proportionality of Mass and Acceleration<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>For a given force, increasing the mass of an object will decrease its acceleration. This means heavier objects (with more mass) require more force to accelerate at the same rate as lighter objects. For example, it is harder to push a truck than a bicycle with the same force.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"579\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121656.063-1024x579.png\" alt=\"\" class=\"wp-image-17350\" style=\"width:425px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121656.063-1024x579.png 1024w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121656.063-300x170.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121656.063-768x434.png 768w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121656.063.png 1472w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-15b6c1349a769cddfe0e043a827e3762\" style=\"color:#000060\"><strong>Units of Measurement<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Force is measured in newtons (N).<\/li>\n\n\n\n<li>Mass is measured in kilograms (kg).<\/li>\n\n\n\n<li>Acceleration is measured in meters per second squared (m\/s2m\/s^2m\/s2).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-c3022b935967c29c7df202d78111296c\" style=\"color:#000060\"><strong>Real-World Examples<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Pushing a Cart<\/strong>: If you push a shopping cart, the harder you push (more force), the faster it accelerates. If the cart is full of heavy items (more mass), it requires more force to achieve the same acceleration.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"579\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121934.563-1024x579.png\" alt=\"\" class=\"wp-image-17351\" style=\"width:443px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121934.563-1024x579.png 1024w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121934.563-300x170.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121934.563-768x434.png 768w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T121934.563.png 1472w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li class=\"has-large-font-size\"><strong>Vehicle Acceleration<\/strong>: The acceleration of a car depends on the engine force and the car&#8217;s mass. A smaller, lighter car accelerates faster than a heavier truck with the same engine force.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"579\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T122104.288-1024x579.png\" alt=\"\" class=\"wp-image-17352\" style=\"width:451px;height:auto\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T122104.288-1024x579.png 1024w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T122104.288-300x170.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T122104.288-768x434.png 768w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2025\/08\/Untitled-design-2025-08-12T122104.288.png 1472w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/div>\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\/76657\/090\/718\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-40.png\" alt=\"\" class=\"wp-image-6459\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-40.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-40-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-2-40-150x150.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\/77032\/511\/804\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-42.png\" alt=\"\" class=\"wp-image-6460\" srcset=\"https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-42.png 500w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-42-300x300.png 300w, https:\/\/9thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-1-42-150x150.png 150w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Second &nbsp;Law Of Motion key points : Statement of the Second Law of Motion Mathematical Expression The Second Law of Motion can be expressed using the formula: Understanding Force, Mass, and Acceleration Direct Proportionality of Force and Acceleration Inverse Proportionality of Mass and Acceleration Units of Measurement Real-World Examples 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-3703","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3703","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=3703"}],"version-history":[{"count":16,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3703\/revisions"}],"predecessor-version":[{"id":17353,"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3703\/revisions\/17353"}],"wp:attachment":[{"href":"https:\/\/9thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=3703"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}