{"id":82347,"date":"2015-04-30T03:00:00","date_gmt":"2015-04-30T00:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=9f8fd4c3d4a4f2c8bdf14eb0c3bac9de"},"modified":"2015-04-30T03:00:00","modified_gmt":"2015-04-30T00:00:00","slug":"on-the-work-of-internal-forces","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=82347","title":{"rendered":"On the work of internal forces"},"content":{"rendered":"<p>We discuss the role of the internal forces and how their work changes the energy of a system. We<br \/>\nillustrate the contribution of the internal work to the variation of the system\u2019s energy, using a<br \/>\npure mechanical example, a thermodynamical system and an example from electromagnetism. We emphasize<br \/>\nthat internal energy variations related to the work of the internal forces should be pinpointed in<br \/>\nthe classroom and placed on the same footing as other internal energy variations such as those<br \/>\ncaused by temperature changes or by chemical reactions.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>We discuss the role of the internal forces and how their work changes the energy of a system. We<br \/>\nillustrate the contribution of the internal work to the variation of the system\u2019s energy, using a<br \/>\npure mechanical example, a thermodynamical system and&#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-82347","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\/82347","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=82347"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/82347\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=82347"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=82347"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=82347"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}