{"id":449313,"date":"2017-09-07T02:00:00","date_gmt":"2017-09-06T23:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=98b9138b900802cd23cf65e5f1c74ed8"},"modified":"2017-09-07T02:00:00","modified_gmt":"2017-09-06T23:00:00","slug":"downhill-cycling-symmetry-breaking-how-the-rider-foils-experiment","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=449313","title":{"rendered":"Downhill cycling symmetry breaking: how the rider foils experiment"},"content":{"rendered":"<p>In high-school teaching of mechanics, we deal, among other things, with the nature of static and<br \/>\nkinetic friction, forces that are proportional to the normal force. Under the influence of<br \/>\nfrictional forces, a body moves down a rough sloped decline at a fixed rate of acceleration that is<br \/>\nindependent of its mass. This situation does not apply to cases where the frictional force is<br \/>\ndependent upon velocity, such as bodies which are moving through a streaming fluid (such as<br \/>\nraindrops falling to the ground). In this case the body moves with a continuously decreasing<br \/>\nacceleration, eventually reaching a terminal velocity when the frictional and gravitational forces<br \/>\nbalance out. This velocity constraint is determined by the dependence of the frictional force on<br \/>\nvelocity and geometric parameters that determine the strength of the frictional force. We show here<br \/>\nthat a similar situation takes place when bicycles descend an incline with a fixed slope. We also<br \/>\ninvestigated the dependence of t&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In high-school teaching of mechanics, we deal, among other things, with the nature of static and<br \/>\nkinetic friction, forces that are proportional to the normal force. Under the influence of<br \/>\nfrictional forces, a body moves down a rough sloped decline at&#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-449313","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\/449313","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=449313"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/449313\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=449313"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=449313"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=449313"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}