{"id":2271,"date":"2023-10-20T20:27:30","date_gmt":"2023-10-20T19:27:30","guid":{"rendered":"https:\/\/helpmyphysics.co.uk\/wordpress\/?p=2271"},"modified":"2023-10-20T20:27:30","modified_gmt":"2023-10-20T19:27:30","slug":"measuring-instantaneous-speed","status":"publish","type":"post","link":"https:\/\/helpmyphysics.co.uk\/wordpress\/?p=2271","title":{"rendered":"Measuring Instantaneous speed"},"content":{"rendered":"<p><a href=\"http:\/\/www.helpmyphysics.co.uk\/flashgames\/instaspeed\/instantspeed.html\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/helpmyphysics.co.uk\/wordpress\/wp-content\/uploads\/2023\/10\/instantspeed-300x239.jpg\" alt=\"\" width=\"300\" height=\"239\" class=\"aligncenter size-medium wp-image-2272\" srcset=\"https:\/\/helpmyphysics.co.uk\/wordpress\/wp-content\/uploads\/2023\/10\/instantspeed-300x239.jpg 300w, https:\/\/helpmyphysics.co.uk\/wordpress\/wp-content\/uploads\/2023\/10\/instantspeed.jpg 768w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>It is impossible to measure the speed of an object at an instant.<br \/>\nIt is only possible to find the object&#8217;s speed over a small distance and time.<br \/>\nThis is achieved using a light gate and a thin card of length say 10 cm.<br \/>\nWhen the card interrupts the light beam it turns off a light sensor and starts an electronic timer.<br \/>\nThe timer stops when the card passes the light beam and the sensor picks up the light signal again.<\/p>\n<p>The near instantaneous speed is calculated by:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/helpmyphysics.co.uk\/wordpress\/wp-content\/uploads\/2023\/10\/equation-300x135.jpg\" alt=\"\" width=\"300\" height=\"135\" class=\"aligncenter size-medium wp-image-2275\" srcset=\"https:\/\/helpmyphysics.co.uk\/wordpress\/wp-content\/uploads\/2023\/10\/equation-300x135.jpg 300w, https:\/\/helpmyphysics.co.uk\/wordpress\/wp-content\/uploads\/2023\/10\/equation.jpg 749w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>It is impossible to measure the speed of an object at an instant. It is only possible to find the object&#8217;s speed over a small distance and time. This is achieved using a light gate and a thin card of length say 10 cm. When the card interrupts the light beam it turns off a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,36,2],"tags":[],"class_list":["post-2271","post","type-post","status-publish","format-standard","hentry","category-physicsnational4","category-physicsnational5","category-physics-news"],"_links":{"self":[{"href":"https:\/\/helpmyphysics.co.uk\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2271","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/helpmyphysics.co.uk\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/helpmyphysics.co.uk\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/helpmyphysics.co.uk\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/helpmyphysics.co.uk\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2271"}],"version-history":[{"count":3,"href":"https:\/\/helpmyphysics.co.uk\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2271\/revisions"}],"predecessor-version":[{"id":2276,"href":"https:\/\/helpmyphysics.co.uk\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2271\/revisions\/2276"}],"wp:attachment":[{"href":"https:\/\/helpmyphysics.co.uk\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2271"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/helpmyphysics.co.uk\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2271"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/helpmyphysics.co.uk\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2271"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}