Cat Twist

Invented, Explained, and Demonstrated by

Dr. Ron Galli

Paper on cat twist, published in The Physics Teacher journal
A simplified explanation of the cat twist

Information on obtaining a model of "Galli cat"

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Click the picture to watch the movie


In order to demonstrate how a cat can turn over over in mid air and land on its feet without a torque, a mechanical model has been constructed and is demonstrated in this movie. This model was constructed from copper tubing, springs, and other metal parts. When this "mechanical cat" is released from an upside down position with its back to the ground, it flips over to land on its feet. The net torque and the net angular momentum remain zero throughout the entire time.