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Chapter 6: 8-17Q (page 138)

A shortstop may leap into the air to catch a ball and throw it quickly. As he throws the ball, the upper part of his body rotates. If you look quickly you will notice that his hips and legs rotate in the opposite direction (Fig. 8鈥�35). Explain.

Short Answer

Expert verified

The hips and legs will rotate in opposite directions to conserve the angular momentum of the body.

Step by step solution

01

Understanding torque and conservation of angular momentum

In this problem, when the player (shortstop) is in the air, the torque exerted on him will be zero. So, the angular momentum of the shortstop in this condition is conserved.

02

Direction of the player’s body

If a player is in mid-air, his upper half of the body, excluding his hips, rotates in a specific direction. On the other hand, while in the throwing motion, the lower half of his body, including hips and legs, will move in the opposite direction to conserve the total body's angular momentum.

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