When you play rugby, you might have noticed that you spin rugby ball. But have you ever thought, why do you spin a rugby ball?
Rugby is a fast-paced sport where you’ve really got to keep your eye on the ball. When players pass the ball to one another, you have noticed that it spins as it flies through the air. You can spin the ball in three different axes; end over end, along with its side, or along its length. Passing the ball head-on means that it’s more aerodynamic than throwing it on its side.
But why spin the ball instead of just passing it with no spin?
Rugby balls are the funny shape, which means when you throw it, it has a wobble through the air. So if you want to get a long pass to make sure that your long process too accurate. You want to reduce the wobble always go anywhere. So if you spin it as you pass it, the ball is more likely to go. Exactly where you wanted to go first of all get your hand position on the ball correctly.
So if you’re passing right-to-left, you want your right hand on the base of the ball, squeeze hard with your fingertips, and the power and spin come from your right hand, pass across your body. If you’re passing left to right you want your left hand near the bottom of the ball and you spin that way across your body and then.
The final tip is once you release the ball left with your hands facing the target or you want it to go.
So spinning the ball makes it more stable and accurate when passing. The reason for this is because it acts like a spinning top. If we take this spinning top and try and balance it on its tip it falls over. But if we give it a spin it stays upright.
The reason it doesn’t topple over is that of the law of conservation of angular momentum. When the top is spinning, it has angular momentum. And because angular momentum is conserved it will resist any change.
Put another way because the top is spinning in one axis, it will resist moving or tipping over in another axis. Because that would mean changing its momentum. The same thing happens we try with the rugby ball. Place it on its end and it falls over. Give it a spin and it stays upright.
So when you pass the ball it rotates on its side and still acts like a spinning top. It’s angular momentum causing it to resist any little wobbles from side to side, meaning it’s much more stable and easier for the other player to catch that all-important path.