Curveballs are thrown with a topspin, which causes the ball to curve downward as it travels through the air. The Magnus effect is the aerodynamic force that causes the curveball to curve. The Magnus effect is created when a spinning object moves through a fluid. The spinning object creates a region of low pressure on one side of the object and a region of high pressure on the other side of the object. The difference in pressure creates a force that pushes the object in the direction of the low pressure region.

In the case of a curveball, the topspin creates a region of low pressure on the top of the ball and a region of high pressure on the bottom of the ball. The difference in pressure creates a force that pushes the ball downward.

Cutters

Cutters are thrown with a sideways spin, which causes the ball to curve in the opposite direction of the spin. The Magnus effect also causes cutters to curve. However, the sideways spin of the cutter creates a region of low pressure on the side of the ball that is moving forward and a region of high pressure on the side of the ball that is moving backward. The difference in pressure creates a force that pushes the ball in the opposite direction of the spin.

Sinkers

Sinkers are thrown with a downward spin, which causes the ball to drop as it travels through the air. The Magnus effect also causes sinkers to drop. However, the downward spin of the sinker creates a region of low pressure on the bottom of the ball and a region of high pressure on the top of the ball. The difference in pressure creates a force that pushes the ball downward.

Sweepers

Sweepers are thrown with a combination of topspin and sideways spin. The topspin causes the ball to curve downward, while the sideways spin causes the ball to curve in the opposite direction of the spin. The Magnus effect causes sweepers to curve. The combination of topspin and sideways spin creates a region of low pressure on the top and side of the ball that is moving forward and a region of high pressure on the bottom and side of the ball that is moving backward. The difference in pressure creates a force that pushes the ball downward and in the opposite direction of the spin.