{"id":203164,"date":"2025-03-18T18:42:39","date_gmt":"2025-03-18T18:42:39","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=203164"},"modified":"2025-03-18T18:42:43","modified_gmt":"2025-03-18T18:42:43","slug":"the-suspension-system-of-a-2000-kg-automobile-sags-l0-cm-when-the-chassis-is-placed-on-it","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/18\/the-suspension-system-of-a-2000-kg-automobile-sags-l0-cm-when-the-chassis-is-placed-on-it\/","title":{"rendered":"The suspension system of a 2000 kg automobile &#8220;sags&#8221; L0 cm when the chassis is placed on it"},"content":{"rendered":"\n<p>The suspension system of a 2000 kg automobile &#8220;sags&#8221; L0 cm when the chassis is placed on it. Also, the oscillation amplitude decreases by 50% each cycle. Estimate the values of<br>(a) The spring constant k and<br>(b) The damping constant b for the spring and shock absorber system of one wheel, assuming each wheel supports 500 kg.<br><\/p>\n\n\n\n<p><strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\">The correct answer and explanation is:<\/mark><\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Solution:<\/h3>\n\n\n\n<p>(a) <strong>Spring Constant kk:<\/strong><\/p>\n\n\n\n<p>Each wheel supports a mass of m=2000&nbsp;kg4=500&nbsp;kgm = \\frac{2000 \\text{ kg}}{4} = 500 \\text{ kg}<\/p>\n\n\n\n<p>The weight of this mass is F=mg=(500)(9.81)=4905&nbsp;NF = mg = (500)(9.81) = 4905 \\text{ N}<\/p>\n\n\n\n<p>From Hooke\u2019s Law, the force is related to the displacement L0L_0 by: F=kL0F = kL_0<\/p>\n\n\n\n<p>Thus, the spring constant is: k=FL0=4905L0k = \\frac{F}{L_0} = \\frac{4905}{L_0}<\/p>\n\n\n\n<p>(b) <strong>Damping Constant bb:<\/strong><\/p>\n\n\n\n<p>The amplitude of oscillation decreases by 50% per cycle, meaning the damping ratio is significant. The logarithmic decrement \u03b4\\delta is given by: \u03b4=ln\u2061x1x2=ln\u20612=0.693\\delta = \\ln \\frac{x_1}{x_2} = \\ln 2 = 0.693<\/p>\n\n\n\n<p>The damping ratio \u03b6\\zeta is related to \u03b4\\delta by: \u03b6=\u03b44\u03c02+\u03b42\\zeta = \\frac{\\delta}{\\sqrt{4\\pi^2 + \\delta^2}}<\/p>\n\n\n\n<p>Substituting \u03b4=0.693\\delta = 0.693, \u03b6=0.6934\u03c02+0.6932\u22480.110\\zeta = \\frac{0.693}{\\sqrt{4\\pi^2 + 0.693^2}} \\approx 0.110<\/p>\n\n\n\n<p>The natural frequency of the undamped system is: \u03c90=km\\omega_0 = \\sqrt{\\frac{k}{m}}<\/p>\n\n\n\n<p>The damping coefficient is: b=2m\u03b6\u03c90b = 2m\\zeta\\omega_0<\/p>\n\n\n\n<p>Substituting values, b=2(500)(0.110)k500b = 2(500)(0.110) \\sqrt{\\frac{k}{500}}<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Explanation:<\/h3>\n\n\n\n<p>The suspension system in an automobile comprises a spring and a shock absorber. The spring supports the weight of the vehicle, while the shock absorber dissipates energy to reduce oscillations. By knowing the static sag (L0L_0), we estimate the spring constant. The damping constant is derived from the decay of oscillation amplitude. Proper damping ensures the car does not bounce excessively, improving stability and comfort.<\/p>\n\n\n\n<p>Now, I&#8217;ll generate an image illustrating the suspension system and key parameters.<\/p>\n\n\n\n<p>Here is the labeled diagram of a car suspension system, showing the key parameters like mass (mm), spring constant (kk), damping coefficient (bb), displacement (L0L_0), and oscillation decay. Let me know if you need any modifications or further explanations!<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/03\/image-1056.png\" alt=\"\" class=\"wp-image-203165\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>The suspension system of a 2000 kg automobile &#8220;sags&#8221; L0 cm when the chassis is placed on it. Also, the oscillation amplitude decreases by 50% each cycle. Estimate the values of(a) The spring constant k and(b) The damping constant b for the spring and shock absorber system of one wheel, assuming each wheel supports 500 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","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":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"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":""},"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":[25],"tags":[],"class_list":["post-203164","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/203164","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=203164"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/203164\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=203164"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=203164"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=203164"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}