What You'll Get
Choose from Three Options
- $15.50 for two 90-minute adult soccer classes ($30 value)
- $30 for four 90-minute adult soccer classes ($60 value)
- $40 for six 90-minute adult soccer classes ($90 value)
Bending the Ball: A New Spin on Soccer Shots
Whenever a soccer ball curves, seemingly changing its orbit in midair, NASA scientists may rush to classify it as a planet. But in fact, the movement is due to yet another physics concept pioneered by Isaac Newton: the Magnus effect, a phenomenon first described in regard to tennis. Newton noted that topspin made the ball dip, whereas backspin made for a straighter trajectory. In other words, the way a ball spins affects its path in the air.
Usually, a ball curves in the same direction in which it’s spinning; air moves with the ball on the side that spins forward, pushing it in the other direction. A ball spinning counter-clockwise, for example, tends to bend to the left. But a ball’s movement may not always be so easy to predict. Its trajectory is also affected by the smoothness of the ball’s surface. In fact, a perfectly smooth (or laminar) ball would likely curve in the opposite direction of a rough-surfaced (or turbulent) ball when kicked in exactly the same manner.
Of course, nobody plays soccer with a perfectly smooth ball, despite the substantial benefit it would have on blooper-reel ratings. Even so, different stitching patterns do alter the roughness of a ball’s surface. This is why there seems to be a controversy every four years over a new ball design—even the coolest new look can have a drastic effect on a ball’s in-flight physics.
The Fine Print
Promotional value expires 120 days after purchase. Amount paid never expires. Not valid for clients active within the past 6 month(s). Merchant's standard cancellation policy applies (any fees not to exceed voucher price). Limit 1 per person, may buy 2 additional as gifts. Limit 1 per visit. Valid only for option purchased. All goods or services must be used by the same person. Ages 16 & up. Registration through the website or in person is required. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.