Kinesiology 2241A/B Lecture Notes - Lecture 32: Angular Velocity
7 Apr 2018
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Recall that the amount of angular momentum is related to the radius of gyration squared, as in. Changing radius of gyration changes the rate of rotation drastically due to. So when you change the radius of gyration, you change the angular velocity squared. Since individual segments can generate angular momentum internally, this can be used to delay or speed up rotation in the rest of the body. Lets say we"re ski jumping and the overall body is rotating forward too much. Swinging the arms forward causes the body to rotate backwards restoring our proper position. When a gymnast leaves an apparatus with some unwanted twisting rotation about their long axis, they can do a cowboy tuck. Knees out to the side slow the twisting about the long axis. When a volleyball player goes up for a spike they have no angular momentum about the longitudinal axis. This must be counteracted by the rest of the body.
