Speed of a bike using an iPhone: measure speed from frame rate, iPhone slow motion. скачать в хорошем качестве

Speed of a bike using an iPhone: measure speed from frame rate, iPhone slow motion.

0:00 Review of constant velocity kinematics. 1:04 Measuring delta-x for the bike. 1:50 Finding your iPhone frame rate and how to convert frames to time, delta-t. 2:54 Using Quicktime Player to count frames in a slow motion video. 3:45 Final calculations: measure speed from frame rate for iPhone slow motion video. 🧠 Access full flipped physics courses with video lectures and examples at https://www.zakslabphysics.com/ In this video, we show how to precisely measure the speed of a bike using an iPhone. We measure speed of an object in a video from frame rate using iPhone slow motion video. We start with a quick review of constant velocity kinematics and recall that speed = distance/time. We take video of a physics professor riding a bike through a 5.0m distance marked out on a trail. Next, we show how to determine the iPhone slow motion frame rate, and we come up with a plan for converting the number of frames to the number of seconds. We show how to use Quicktime Player to count frames from the video, and we determine the number of frames as the front tire goes from the starting line to the finish line, which allows us to measure speed from frame rate because it gives us the time for speed=distance/time. Finally, we convert frames to time and determine the speed of the bicycle in m/s and mi/hr.