Physics 2065A/B Lecture Notes - Rising Fast, Makita, Knuckleball
13 Mar 2013
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Magnus force: pitching a baseball and shooting a puck. When we discussed the affect of air drag we ignored the fact an object may also be rotating. Rotation causes the air to affect the object differently on either side. This difference in force on the object due to air resistance is called magnus force. By rotating the air on the side of rotation will be moving more quickly, causing the ball to feel an extra force making it move horizontally. Consider the motion of air around the ball. The air"s speed near the bottom of the ball is increased by the ball"s rotation and, vice versa, the air"s speed is lowed down near the top fo the ball due to its rotation. >hence, the air on the bottom of the ball moves faster than the air on top of the ball. Therefore, the pressure on the top of the ball is greater compared to the bottom.
