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Not only a ball with a rough surface but also a smooth ball can be made to curve when thrown, but these balls will curve in opposite directions. Why? (See "Effect of Spin and Speed on the Curve of a Baseball and the Magnus Effect for Smooth Spheres," by Lyman J. Briggs, American Journal of Physics, November 1959, p. 589.)

Not only a ball with a rough surface but also a smooth ball can be made to curve when thrown, but these balls will curve in opposite directions. Why? (See "Effect of Spin and Speed on the Curve of a Baseball and the Magnus Effect for Smooth Spheres," by Lyman J. Briggs, American Journal of Physics, November 1959, p. 589.)

Grade:upto college level

1 Answers

Navjyot Kalra
askIITians Faculty 654 Points
8 years ago
When the smooth ball is thrown, it spins in the air opposite to the ball which have rough surface. The circulation of the air layer around the ball is such that there is a low pressure region on one side of the ball and high pressure region on the other side. Thus, a net force acts on the ball due to the variation of pressure of the air layer on its sides. So, a net force acts in the direction opposite to the ball which have rough surface. Thus, the smooth ball will curve opposite to the direction made by the rough ball.

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