DD03Video Analysis of Projectile Motion Larry Dukerich - Arizona State U & Dobson HS Dwain Desbien - Arizona State U & Chandler- Gilbert College
Video analysis software- a useful tool Clip from Physics of Sports
Video analysis software- a useful tool Slope = velocity Slope = acceleration Graphs from VideoGraph - PAS
Video analysis software • Canned movies are OK, but… • They’re someone else’s idea of interesting motion. • Students don’t get chance to produce and examine parabolic motion on their own.
Video capture - then • Expensive hardware requirements • fast computers with video cards • expensive, high-end VCR’s • Used to be difficult and tedious • frame by frame capture • dropped frames made analysis tricky
Video capture - now, with iMac • Alt 1: VHS and video capture box • Use low-cost iMac ($800) or USB G3 Mac • Standard VHS camera or VCR • MyVideo from Eskape Labs ($250) www.eskapelabs.com Avid Cinema software
USB Video capture box Output to USB port Composite video signal from VCR or camera
Video capture - with iMac DV • Alt 2: Digital video input • Digital camera and Firewire (IEEE 1394) • iMac DV ($1000) • iMovie software
Digital video - iMac DV FireWire connector
Physics - 2nd Quarter Project • Produce and analyze video of projectile motion. • Teams of 3 - 4 students • Done outside of class time • Required minimal teacher intervention
Sample student movies Object of known length for calibration
Sample student movies Ashley & Lindsay - Girls’ soccer team
Sample student movies Garrett wanted to jump from the 2nd floor.
Sample student movies A boy and his dog
Sample student movies Not your typical basketball shot.
Sample student movies Restriction: no living thing may come to harm.
Sample student movies Crash and burn!