{"id":279984,"date":"2016-09-15T02:00:00","date_gmt":"2016-09-14T23:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=f8710168f48723231a5d40d361f8cdc3"},"modified":"2016-09-15T02:00:00","modified_gmt":"2016-09-14T23:00:00","slug":"workenergy-theorem-and-friction-forces-two-experiments","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=279984","title":{"rendered":"Work?energy theorem and friction forces: two experiments"},"content":{"rendered":"<p>Several studies have showed the subsistence, even in students enrolled in scientific degree courses,<br \/>\nof spontaneous ideas regarding the motion of bodies that conflict with Newton?s laws. One of the<br \/>\ncauses is related to the intuitive preconceptions that students have about the role of friction as a<br \/>\nforce. In fact, in real world novices do not recognise friction as a force, and for this reason they<br \/>\nmay believe that a motion with a constant speed needs as a necessary condition the presence of a<br \/>\nconstant force in the same direction of the motion. In order to face these ?intuitive ways of<br \/>\nreasoning?, in this paper we propose two sequential experiments that can allow undergraduate<br \/>\nstudents to clarify the role of friction forces through the use of the work?energy theorem. This is<br \/>\na necessary first step on the way to a deeper understanding of Newton?s second law. We have planned<br \/>\nour experiments in order to strongly reduce quantitative difficult calculations and to facilita&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Several studies have showed the subsistence, even in students enrolled in scientific degree courses,<br \/>\nof spontaneous ideas regarding the motion of bodies that conflict with Newton?s laws. One of the<br \/>\ncauses is related to the intuitive preconceptions th&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-279984","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/279984","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=279984"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/279984\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=279984"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=279984"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=279984"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}