A gymnast falling counterclockwise off a balance beam will tend to swing their a

Question

A gymnast falling counterclockwise off a balance beam will tend to swing their arms in the direction of the fall (counterclockwise). Which of the following best explains why this is the typical reaction? 5. The counterclockwise torque created by shoulder muscles on the gymnasts arms results a. in an equal but opposite reaction torque (clockwise) on the trunk which would tend to upright the athlete. b. The counterclockwise arm swing absorbs the total angular momentum of the athlete and reduces the total body counterclockwise angular acceleration The athlete should actually swing their arms in the opposite direction of the fall c. (clockwise) to prevent counterclockwise angular acceleration. d. The direction of arm swing (counterclockwise or clockwise) has no effect on total body angular acceleration. 6. W hen throwing a ball, if the angular velocity of the shoulder increases, what will happen to the linear velocity of the wrist? a. stay the same b. increase c. decrease d. the wrist has no linear velocity

Explanation / Answer

5. b. The counterclockwise arm swing absorbs the total angular momentum of the athlete and reduces the total body counterclockwise angular acceleration.

6. When throwing a ball, if the angular velocity of the shoulder increases, the linear velocity of the wrist increases, so the answer is b.

Maximum shoulder internal rotation at ball release has been associated with an increase in ball velocity. This is only possible when the linear velocity of the wrist increases.

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