just taking a short break, away from books and blog-hop. found this
Shuttle Badminton Why does the shuttle cock turn upon hitting (i.e When you hit it, the tip of the shuttle is facing you, but after hitting the tip faces the opponent and shuttle reaches him, now the tip facing the opponent. Why)?When we hit the tip of the shuttle with the racket a large impulse is imparted to the shuttle which produces both the rotation as well as linear motion of shuttle. The rotation occurs due to the torque produced by the impulse. There is no way we can assure that we hit the shuttle along its axis and produce no torque, the impulse will always produce a torque which results in rotation. Now, the question can be asked why does it rotate only 180 degrees and not more or less.. The answer is in the mass distribution of the shuttle. The tip has a very high mass when compared to the feathers. The shuttle does rotate more or less than 180 degrees but it is the mass of the tip which tries to bring it to the equilibrium position.This can also be explained in terms of air flowing across thhe object. When the tip makes contact with the racquet, the original orientation is tip behind and feathers forward. This causes air flow to be unsteady and irregular (since it flows both outside and between the feathers). Hence this is a sort of unstable equillibrium (something like electric dipole in a constant field, you have two parts of the object in a flow field). Thus a small disturbance is enough to produce a torque, which tends to turn it around. Now, when the tip is forward, you don't have much air flowing between the feathers but only outside the object. This is sort of stable equilibrium, and even small disturbances are nullified.There is one more explanation. You just throw a shuttle vertically up with hand, the tip facing upwards. On reaching the top point, as the shuttle starts to come down, it turns upside down; the tip now faces the ground. This turning can be explained with the help ofthe concept of Centre of Mass (COM). As the tip is very heavy, the centre of mass of the shuttle is very close to the tip. So, when the shuttle reaches the top, it is never in absolutely straight position (i.e its axis is never along the vertical axis); it is slightly tilted. As the actual centre of mass doesn't match with the geometric centre of mass, due to tilting there is a torque produced about the geometric COM and the shuttle rotates. Even though we assume that the shuttle is exactly vertical at the highest point, after falling a very small distance it'll get slightly tilted and that tilt will be enough to turn it around.
i realise.i won't be touching science any more soon. bound to miss out some facts in life.but i think i'll do away without it.ha
just taking a short break, away from books and blog-hop. found this
Shuttle Badminton Why does the shuttle cock turn upon hitting (i.e When you hit it, the tip of the shuttle is facing you, but after hitting the tip faces the opponent and shuttle reaches him, now the tip facing the opponent. Why)?When we hit the tip of the shuttle with the racket a large impulse is imparted to the shuttle which produces both the rotation as well as linear motion of shuttle. The rotation occurs due to the torque produced by the impulse. There is no way we can assure that we hit the shuttle along its axis and produce no torque, the impulse will always produce a torque which results in rotation. Now, the question can be asked why does it rotate only 180 degrees and not more or less.. The answer is in the mass distribution of the shuttle. The tip has a very high mass when compared to the feathers. The shuttle does rotate more or less than 180 degrees but it is the mass of the tip which tries to bring it to the equilibrium position.This can also be explained in terms of air flowing across thhe object. When the tip makes contact with the racquet, the original orientation is tip behind and feathers forward. This causes air flow to be unsteady and irregular (since it flows both outside and between the feathers). Hence this is a sort of unstable equillibrium (something like electric dipole in a constant field, you have two parts of the object in a flow field). Thus a small disturbance is enough to produce a torque, which tends to turn it around. Now, when the tip is forward, you don't have much air flowing between the feathers but only outside the object. This is sort of stable equilibrium, and even small disturbances are nullified.There is one more explanation. You just throw a shuttle vertically up with hand, the tip facing upwards. On reaching the top point, as the shuttle starts to come down, it turns upside down; the tip now faces the ground. This turning can be explained with the help ofthe concept of Centre of Mass (COM). As the tip is very heavy, the centre of mass of the shuttle is very close to the tip. So, when the shuttle reaches the top, it is never in absolutely straight position (i.e its axis is never along the vertical axis); it is slightly tilted. As the actual centre of mass doesn't match with the geometric centre of mass, due to tilting there is a torque produced about the geometric COM and the shuttle rotates. Even though we assume that the shuttle is exactly vertical at the highest point, after falling a very small distance it'll get slightly tilted and that tilt will be enough to turn it around.
i realise.i won't be touching science any more soon. bound to miss out some facts in life.but i think i'll do away without it.ha