What You'll Get
Choose Between Two Options
- $30 for eight weeks on a recreational sports team ($60 value)
- $57.50 for eight weeks on a recreational sports team for two ($120 value)
The spring season begins April 20, with one game played each week. Choose from soccer, dodgeball, sand volleyball, cornhole, or kickball. Team t-shirts and water or sports drinks are included. Learn more about games and joining or starting a team here.
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 180 days after purchase. Amount paid never expires. May be repurchased every 120 days. Limit 1 per person, may buy 1 additional as gift. Valid only for option purchased. Reservation required; subject to availability and weather. Merchant's standard cancellation policy applies (any fees not to exceed voucher price). All goods or services must be used by the same person. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.