This lab uses Tracker to measure and analyze the center of mass motion of a person landing after a jump. Students measure the acceleration of the person in free-fall and his acceleration while he is landing and slowing down. Students use the data to calculate the force of impact by the floor on the student during the landing. There are two video files:  (1) the student bends his knees a maximum amount during the landing in order to decrease the force of impact by the floor; and (2) the student bends his knees a small amount in order to increase the force of impact on the floor.

The trz file contains two videos: (1) a long time interval during the landing and (2) a short time interval during the landing. The videos were recorded by Aaron Titus at High Point University.

The videos can be used with other video analysis software; however, the handout has screen captures from Tracker and instructions specifically written for Tracker.