{"id":213281,"date":"2025-05-10T07:11:42","date_gmt":"2025-05-10T07:11:42","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=213281"},"modified":"2025-05-10T07:11:44","modified_gmt":"2025-05-10T07:11:44","slug":"saved-tension-forces-always-act-upward","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/05\/10\/saved-tension-forces-always-act-upward\/","title":{"rendered":"Saved Tension forces always act upward."},"content":{"rendered":"\n

Saved Tension forces always act upward. True False Question 4 (1 point) Newton’s third law states that forces always act in pairs but the two forces of any pair act on different objects. True False Question 7 (1 point) A rocket accelerates upward and the thrust of the engines overcome the frictional forces and the gravity acting against the rocket causing it to accelerate upwards. Which of Newton’s laws of motion best explains this situation? a) None of the laws explain this situation b) Newton’s Third Law c) Newton’s Second Law Od) Newton’s First Law Question 11 (1 point) Consider the following FBDs. B ? D Fr Fy Fr+FM FA+Fx E F F \u00c8 An elevator is suspended by a cable and moves uniformly upward. Which of the above free body diagrams best represents the forces acting on the elevator? O a) B b) c Ode d) A O e D Question 13 (1 point) Which of the following would Newton’s first law alone not account for? A passenger leans forward in her seat when the car’s brakes are applied. During launch, astronauts feel that they are being pushed back into their seats. No matter how hard you push against it, the boulder would not move. O A cyclist pedals harder and increases the speed of her bike.<\/p>\n\n\n\n

The Correct Answer and Explanation is:<\/strong><\/p>\n\n\n\n

Let’s go through each question, provide the correct answer, and explain the reasoning using at least 300 words<\/strong> for the full set.<\/p>\n\n\n\n

\n\n\n\n

Question 4:<\/strong><\/h3>\n\n\n\n

Saved Tension forces always act upward.<\/strong>
Answer:<\/strong> False<\/strong><\/p>\n\n\n\n

Explanation:<\/strong>
Tension is a pulling force transmitted through a string, rope, cable, or similar object. It acts along the direction of the rope or cable<\/strong>, not necessarily upward. The direction of the tension force depends on the configuration of the system. For example:<\/p>\n\n\n\n

    \n
  • In a hanging object, tension acts upward<\/strong> because the rope pulls upward against the downward force of gravity.<\/li>\n\n\n\n
  • If two people pull on a rope in opposite horizontal directions, the tension acts horizontally<\/strong>.<\/li>\n\n\n\n
  • If a rope is inclined, the tension force has both horizontal and vertical components<\/strong>.<\/li>\n<\/ul>\n\n\n\n

    So, it’s incorrect to say tension always acts upward. It acts along the rope and away from the object<\/strong>, aligning with the rope’s direction.<\/p>\n\n\n\n

    \n\n\n\n

    Question 7:<\/strong><\/h3>\n\n\n\n

    Which of Newton’s laws of motion best explains the rocket accelerating upward?<\/strong>
    Correct Answer:<\/strong> c) Newton’s Second Law<\/strong><\/p>\n\n\n\n

    Explanation:<\/strong>
    Newton\u2019s Second Law states:
    F = ma<\/strong>, where F<\/strong> is the net force, m<\/strong> is mass, and a<\/strong> is acceleration.<\/p>\n\n\n\n

    In this rocket scenario:<\/p>\n\n\n\n

      \n
    • The rocket engines produce thrust<\/strong>.<\/li>\n\n\n\n
    • Gravity<\/strong> and air resistance<\/strong> oppose this motion.<\/li>\n\n\n\n
    • When thrust > gravity + resistance<\/strong>, the net force becomes positive upward<\/strong>, and thus the rocket accelerates upward<\/strong>.<\/li>\n<\/ul>\n\n\n\n

      This is a perfect application of Newton\u2019s Second Law. It explains how acceleration results from a net force<\/strong> acting on the rocket. Newton\u2019s Third Law (action-reaction pairs) does explain the reaction thrust from expelling gas, but the question specifically focuses on why the rocket accelerates<\/strong> upward\u2014making the Second Law most relevant.<\/p>\n\n\n\n

      \n\n\n\n

      Question 11:<\/strong><\/h3>\n\n\n\n

      An elevator is suspended by a cable and moves uniformly upward. Which FBD best represents this?<\/strong>
      Correct Answer:<\/strong> b) C<\/strong><\/p>\n\n\n\n

      Explanation:<\/strong>
      Uniform upward motion means constant velocity<\/strong>\u2014there is no acceleration<\/strong>. According to Newton\u2019s First Law and Second Law:<\/p>\n\n\n\n

        \n
      • The net force is zero<\/strong>.<\/li>\n\n\n\n
      • Tension force (upward)<\/strong> is equal in magnitude<\/strong> to the gravitational force (downward)<\/strong>.<\/li>\n<\/ul>\n\n\n\n

        So, the FBD should show:<\/p>\n\n\n\n

          \n
        • Two opposing forces of equal length<\/strong>: tension upward and gravity downward.<\/li>\n<\/ul>\n\n\n\n

          This corresponds to diagram C<\/strong> (assuming C shows balanced vertical forces), where Fy = weight<\/strong> and they cancel out, meaning zero net force and uniform motion.<\/p>\n\n\n\n

          \n\n\n\n

          Question 13:<\/strong><\/h3>\n\n\n\n

          Which of the following would Newton’s First Law alone not<\/em> account for?<\/strong>
          Correct Answer:<\/strong> A cyclist pedals harder and increases the speed of her bike.<\/strong><\/p>\n\n\n\n

          Explanation:<\/strong>
          Newton\u2019s First Law explains motion in the absence of a net force<\/strong>:<\/p>\n\n\n\n

            \n
          • An object at rest stays at rest.<\/li>\n\n\n\n
          • An object in motion continues in a straight line at constant speed unless acted upon by a net external force<\/strong>.<\/li>\n<\/ul>\n\n\n\n

            Let\u2019s analyze the choices:<\/p>\n\n\n\n

              \n
            • Passenger leans forward<\/strong>: Inertia (1st law)<\/li>\n\n\n\n
            • Astronauts feel pushed back<\/strong>: Inertia<\/li>\n\n\n\n
            • Boulder doesn\u2019t move despite pushing<\/strong>: No net force<\/li>\n\n\n\n
            • Cyclist pedals harder and accelerates<\/strong>: This involves a net force causing acceleration<\/strong>, which is explained by Newton\u2019s Second Law<\/strong>, not the first.<\/li>\n<\/ul>\n\n\n\n

              So, the last option is not explained by Newton\u2019s First Law alone<\/strong>, making it the correct answer.<\/p>\n\n\n\n

              \n","protected":false},"excerpt":{"rendered":"

              Saved Tension forces always act upward. True False Question 4 (1 point) Newton’s third law states that forces always act in pairs but the two forces of any pair act on different objects. True False Question 7 (1 point) A rocket accelerates upward and the thrust of the engines overcome the frictional forces and the […]<\/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-213281","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/213281","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=213281"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/213281\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=213281"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=213281"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=213281"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}