{"id":6239,"date":"2020-10-13T15:32:27","date_gmt":"2020-10-13T10:02:27","guid":{"rendered":"http:\/\/astan.lk\/al_virtualclassroom\/?p=6239"},"modified":"2020-10-13T15:32:19","modified_gmt":"2020-10-13T10:02:19","slug":"kinematics","status":"publish","type":"post","link":"https:\/\/astan.lk\/al_virtualclassroom\/kinematics\/","title":{"rendered":"Kinematics"},"content":{"rendered":"<p><span style=\"text-decoration: underline;\"><strong>Speed and velocity<\/strong><\/span><\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/sv.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7885 alignleft\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/sv.png\" alt=\"sv\" width=\"155\" height=\"84\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong><span style=\"text-decoration: underline;\">Acceleration<\/span><\/strong><\/p>\n<p>Acceleration is defined as rate of change of velocity.<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/acc.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7886 alignleft\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/acc.png\" alt=\"acc\" width=\"231\" height=\"39\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"text-decoration: underline;\"><strong>Linear motion equations<\/strong><\/span><\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/kn.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-7901\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/kn.png\" alt=\"kn\" width=\"288\" height=\"79\" \/><\/a><\/p>\n<p><strong>v=u+at \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 S=ut+\u00bdat\u00b2 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 v\u00b2=u\u00b2+2as \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 S=\u00bd(v+u)\/t<\/strong><\/p>\n<div class=\"datasection\">\n<div class=\"line datadesc\"><\/div>\n<div class=\"line description\">\n<div class=\"btitlehold\">\n<h3 class=\"blocktitle\"><span style=\"text-decoration: underline;\"><strong>Displacement vs Time graph<\/strong><\/span><\/h3>\n<p>Gradient of a displacement vs time graph gives \u00a0velocity.<\/p>\n<\/div>\n<div align=\"justify\"><b>There are several types of displacement time graphs. Every displacement time graph represents the nature of motion of the body.<\/b><\/div>\n<div align=\"justify\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/www.cyberphysics.co.uk\/graphics\/diagrams\/dynamics\/dt%20stationary.gif\" width=\"222\" height=\"188\" \/>gradient = 0 m\/s so velocity = 0 m\/s<\/div>\n<div align=\"justify\"><\/div>\n<div align=\"justify\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/www.cyberphysics.co.uk\/graphics\/diagrams\/dynamics\/dt%20const.gif\" width=\"262\" height=\"181\" \/><\/div>\n<div align=\"justify\"><\/div>\n<div align=\"justify\">For a body moving with non-uniform velocity means that the displacement of the body covers in equal of interval of time is increasing, then the displacement time graph is a curved line tells that the velocity is increasing.<\/div>\n<div align=\"justify\"><img decoding=\"async\" title=\"Displacement Time Graph\" src=\"http:\/\/images.tutorvista.com\/cms\/images\/83\/displacement-time-graph-3.PNG\" alt=\"Displacement Time Graph\" \/><\/div>\n<div align=\"justify\">If we draw the tangent at several points on the graph, we observe that as the time increases the slope of the tangent also increases. Increasing slope shows that the velocity is not uniform and the motion is accelerated.<\/div>\n<div align=\"justify\">For a body moving with non-uniform velocity means that the displacement of the body covers in equal of interval of time is decreasing, then the displacement time graph is a curved line tells that the velocity is decreasing.<br \/>\n<img decoding=\"async\" title=\"Displacement Time Graph\" src=\"http:\/\/images.tutorvista.com\/cms\/images\/83\/displacement-time-graph-4.PNG\" alt=\"Displacement Time Graph\" \/><br \/>\nIf we draw the tangent at several points on the graph we could see that as the time increases the slope of the tangent decreases. Decreasing slope shows that the velocity is not uniform and the motion is retarded.<\/div>\n<div align=\"justify\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/www.cyberphysics.co.uk\/graphics\/diagrams\/dynamics\/dt%20back.gif\" width=\"194\" height=\"173\" \/><\/div>\n<div align=\"justify\">\u00a0The negative gradient indicates it is moving in the opposite direction (moving &#8216;backwards&#8217;) &#8211; so it finishes up where it started<\/div>\n<div align=\"justify\"><\/div>\n<h3 align=\"justify\"><strong><span style=\"text-decoration: underline;\">Velocity vs Time graph<\/span><\/strong><\/h3>\n<p>Gradient of a velocity-time graph gives acceleration. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Area under v-t graph gives displacement.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/www.physicsclassroom.com\/Class\/1DKin\/U1L4b2.gif\" width=\"219\" height=\"157\" \/>\u00a0 \u00a0Uniform velocity<\/p>\n<table class=\"data\" style=\"height: 178px;\" width=\"373\">\n<tbody>\n<tr>\n<th width=\"50%\">Positive Velocity<br \/>\nZero Acceleration<\/th>\n<th width=\"50%\">Positive Velocity<br \/>\nPositive Acceleration<\/th>\n<\/tr>\n<tr>\n<td><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.physicsclassroom.com\/Class\/1DKin\/U1L4a4.gif\" width=\"167\" height=\"129\" \/><\/td>\n<td><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.physicsclassroom.com\/Class\/1DKin\/U1L4a5.gif\" width=\"167\" height=\"129\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img decoding=\"async\" src=\"http:\/\/www.physicsclassroom.com\/Class\/1DKin\/U1L4a7.gif\" \/><\/p>\n<\/div>\n<div class=\"line description\"><img decoding=\"async\" src=\"http:\/\/www.physicsclassroom.com\/Class\/1DKin\/U1L4a6.gif\" \/>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Accelerating \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Decelerating<\/div>\n<\/div>\n<div class=\"line description\"><\/div>\n<p class=\"line description\"><strong><span style=\"text-decoration: underline;\">Acceleration vs Time graph<\/span><\/strong><\/p>\n<p class=\"line description\">Area=at=v-u=change in velocity<\/p>\n<p><a href=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/at.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7900 alignleft\" src=\"http:\/\/astan.lk\/al_virtualclassroom\/wp-content\/uploads\/2017\/01\/at.png\" alt=\"at\" width=\"229\" height=\"151\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Speed and velocity &nbsp; &nbsp; &nbsp; Acceleration Acceleration is defined as rate of change of velocity. &nbsp; &nbsp; Linear motion equations v=u+at \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 [&hellip;]<\/p>\n","protected":false},"author":842,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[16,1948],"tags":[],"class_list":["post-6239","post","type-post","status-publish","format-standard","hentry","category-physics","category-unit-02-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Kinematics - Learning &amp; 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