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In this experiment, Mike Krieg utilized advanced high-speed video technology to analyze the bouncing behavior of a racquetball dropped from a height of approximately 3.5 feet. The video, captured at 1200 frames per second using a Phantom v4.3 camera, was meticulously examined frame by frame to extract the positions of the ball throughout impact. Two distinct methods, namely the Velocity Method and the Ball Deflection Method, were employed to determine the coefficient of restitution of the ball, resulting in values of 0.8950 and 0.8693, respectively.
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Lab#2 Bouncing BallSupplemental Testing Experiments and analysis performed by Mike Krieg
Ultra High Speed Video • High speed video taken using Phantom v4.3 high speed camera • Video filmed at 1200 fps • Racquetball dropped from ~3.5ft
Analysis • Video was analyzed frame by frame to extract racquetball positions throughout impact. • Positions determined for top and bottom of ball (middle taken as average) • 2 independent methods were employed to determine restitution coefficient from position data
Velocity Method According to the velocity method the coefficient of restitution was determined to be 0.8950
Ball Deflection Method Coefficient defined by ratio of reaction impulses during impact Reaction forces approximated using Hooke’s Law According to the deflection method the coefficient of restitution was determined to be 0.8693