{"id":164,"date":"2015-12-12T17:03:54","date_gmt":"2015-12-12T17:03:54","guid":{"rendered":"https:\/\/blue-mathbelt.marjoriesayer.com\/?p=164"},"modified":"2020-10-11T17:39:56","modified_gmt":"2020-10-11T17:39:56","slug":"physics-mechanical-equilibrium-newtons-first-law","status":"publish","type":"post","link":"https:\/\/blue-mathbelt.marjoriesayer.com\/?p=164","title":{"rendered":"Physics: Mechanical Equilibrium & Newton’s First Law"},"content":{"rendered":"

Which of these objects is at mechanical equilibrium:<\/p>\n

    \n
  1. A seagull standing on top of a fence post.<\/li>\n
  2. A car moving due south at 40 kilometers\u00a0per hour.<\/li>\n
  3. A water drop from a\u00a0kitchen\u00a0tap, just before it hits the surface of the sink.<\/li>\n
  4. A rain drop from the sky, just before it hits the ground.<\/li>\n
  5. A car as it enters the freeway, traveling from a surface road where the speed limit is 60 km\/h to the freeway where the speed limit is 100 km\/h. The driver’s foot is pressing the accelerator.<\/li>\n
  6. A can in a factory on a conveyor belt moving at 0.1 m\/s.<\/li>\n
  7. A bicycle wheel rolling in a straight line at 50 revolutions per second.<\/li>\n
  8. A coin\u00a0after it is dropped from someone’s hand and before it hits the ground.<\/li>\n
  9. A rock thrown up in the air, at the very top of its journey through the air.<\/li>\n
  10. The earth as it travels around the sun. (This is a trick question, something to think about. Assume that the earth travels around the sun in a circle, and assume that the earth’s speed is constant. The earth’s orbit is approximately circular and its speed is approximately constant – after all, it goes around pretty steadily once a year.)<\/li>\n<\/ol>\n

    Answers<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Which of these objects is at mechanical equilibrium: A seagull standing on top of a fence post. A car moving due south at 40 kilometers\u00a0per hour. A water drop from a\u00a0kitchen\u00a0tap, just before it hits the surface of the sink. A rain drop from the sky, just before it hits the ground. A car as […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":["post-164","post","type-post","status-publish","format-standard","hentry","category-physics-newtons-first-law"],"_links":{"self":[{"href":"https:\/\/blue-mathbelt.marjoriesayer.com\/index.php?rest_route=\/wp\/v2\/posts\/164","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blue-mathbelt.marjoriesayer.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blue-mathbelt.marjoriesayer.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blue-mathbelt.marjoriesayer.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blue-mathbelt.marjoriesayer.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=164"}],"version-history":[{"count":3,"href":"https:\/\/blue-mathbelt.marjoriesayer.com\/index.php?rest_route=\/wp\/v2\/posts\/164\/revisions"}],"predecessor-version":[{"id":184,"href":"https:\/\/blue-mathbelt.marjoriesayer.com\/index.php?rest_route=\/wp\/v2\/posts\/164\/revisions\/184"}],"wp:attachment":[{"href":"https:\/\/blue-mathbelt.marjoriesayer.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=164"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blue-mathbelt.marjoriesayer.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=164"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blue-mathbelt.marjoriesayer.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=164"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}