{"id":441,"date":"2022-02-09T14:03:45","date_gmt":"2022-02-09T21:03:45","guid":{"rendered":"https:\/\/firstdrafts.net\/physicalscience\/?p=441"},"modified":"2022-02-09T16:22:04","modified_gmt":"2022-02-09T23:22:04","slug":"freefall","status":"publish","type":"post","link":"https:\/\/firstdrafts.net\/physicalscience\/freefall\/","title":{"rendered":"motion analysis: freefall"},"content":{"rendered":"\n<p>Adam went to the trouble of throwing a ball up into the air in his office. The ball not only went up; it came back down. Here&#8217;s video of the event:<\/p>\n\n\n\n<figure class=\"wp-block-video\"><video controls src=\"https:\/\/firstdrafts.net\/physicalscience\/wp-content\/uploads\/2022\/02\/freefall-red-ball.mp4\"><\/video><\/figure>\n\n\n\n<p class=\"has-text-align-center\">(It&#8217;s also <a rel=\"noreferrer noopener\" href=\"https:\/\/youtu.be\/0OZJjXqsd_Q\" target=\"_blank\">available on YouTube, here<\/a>.)<\/p>\n\n\n\n<p>You can study this motion in a variety of ways. In <a href=\"https:\/\/firstdrafts.net\/physicalscience\/motion-analysis\/\" data-type=\"post\" data-id=\"329\">another video example<\/a>, I suggest that you analyze the frames while using some kind of timing device. That could work here, especially if you can advance the video one frame at a time. Another way of doing this is with some video tracking software, such as<a rel=\"noreferrer noopener\" href=\"https:\/\/jst.lucademian.com\/info\/\" target=\"_blank\"> JS Track, available online<\/a> as a web based application. To use this, do the following, OR take a look at <a href=\"https:\/\/youtu.be\/-tmZiiNgjRI\" target=\"_blank\" rel=\"noreferrer noopener\">this video I made showing you the steps I use<\/a>.<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Download the video that I&#8217;ve provided above; or, you can record your own!<\/li><li>In JS Track, you&#8217;ll be prompted to upload the video file there. It&#8217;s best if the video is in mp4 format. That&#8217;s pretty natural for a lot of videos you record, but sometimes you&#8217;ll want to find a way to convert it by doing a quick search on the internet.<\/li><li>Within JS Track, you can advance the video one frame at a time, starting with the first frame that&#8217;s of interest. I usually start with when the ball first leaves my hand. Then, you can leave a mark or point on your object (the red ball, in this case), and then the program will advance the video one frame. If you keep repeating this, you can get a collection of points.<\/li><li>JS Track will then provide you with a bunch of position and time data, just like we created with rolling motion in class. It has a spreadsheet you can use if you download a copy and edit it for your own use, either in Google Sheets or Excel or something similar. <\/li><\/ol>\n\n\n\n<p>There&#8217;s more to talk about, but that&#8217;s exactly what the point of this assignment could be!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Adam went to the trouble of throwing a ball up into the air in his office. The ball not only went up; it came back down. Here&#8217;s video of the event: (It&#8217;s also available on YouTube, here.) You can study this motion in a variety of ways. In another video example, I suggest that you [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_stc_notifier_status":"","_stc_notifier_sent_time":"","_stc_notifier_request":false,"_stc_notifier_prevent":false,"_stc_subscriber_keywords":"","_stc_subscriber_search_areas":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3,6],"tags":[82,45],"class_list":{"0":"post-441","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-notes","7":"category-investigations","8":"tag-freefall","9":"tag-motion"},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/s6DkEt-freefall","_links":{"self":[{"href":"https:\/\/firstdrafts.net\/physicalscience\/wp-json\/wp\/v2\/posts\/441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/firstdrafts.net\/physicalscience\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/firstdrafts.net\/physicalscience\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/firstdrafts.net\/physicalscience\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/firstdrafts.net\/physicalscience\/wp-json\/wp\/v2\/comments?post=441"}],"version-history":[{"count":2,"href":"https:\/\/firstdrafts.net\/physicalscience\/wp-json\/wp\/v2\/posts\/441\/revisions"}],"predecessor-version":[{"id":444,"href":"https:\/\/firstdrafts.net\/physicalscience\/wp-json\/wp\/v2\/posts\/441\/revisions\/444"}],"wp:attachment":[{"href":"https:\/\/firstdrafts.net\/physicalscience\/wp-json\/wp\/v2\/media?parent=441"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/firstdrafts.net\/physicalscience\/wp-json\/wp\/v2\/categories?post=441"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/firstdrafts.net\/physicalscience\/wp-json\/wp\/v2\/tags?post=441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}