Physics and soccer

Physics and

Soccer…

by…Divyangna

Monga

The impossible shot

From 30 meters out, Robert Carlos kicked a ball with the outside of his left foot and curved the bal around a wall of defenders into the upper right ninety of the goal.Physics as well as hundreds of players who do this everyday prove that this shot can be made.

What’s involved?

There are six forces implicated in the resulting of this shot~Force of the kick/ velocity Drag Gravity LiftWeight Magnus force

Force of the kick/velocity

It is the force that makes the ball move in the first place.The force causes the ball to move in a linear trajectory at a certain speed if no other forces are involved.

drag

Drag is caused by air velocity.If the ball is kicked, then it will eventually stop because drag is moving in the opposite direction.

gravity

Gravity is a force that acts on all objects.It pulls objects down towards the earth at a speed of 9.8m/s .If a ball is kicked then it will eventually stop because the earth’s gravity is pulling it down at a constant rate against earth’s surface.

LIFT

weightWeight is a force that is always directed towards the centre of

the earth. In general, the magnitude of the weight depends on the mass of an object. By rule, the weight of a major league soccer ball is one pound (0.453592 kg). A soccer ball is hollow and inflated with high pressure air, so the weight is distributed around the outside of the ball. But we can often think of the weight as collected and acting through a single point called the centre of gravity. The centre of gravity is the average location of the weight of an object. To first order, the centre of gravity for a soccer ball is located at the exact centre of the ball. In flight, the ball rotates about the centre of gravity.

Magnus forces

Magnus force is caused when there is pressure on both sides of an object moving through the air or a fluid.If there is decrease in pressure on one side of an object, then the object will start to curve in that direction. If a soccer ball is kicked with top spin, then it will fall to the ground faster because gravity is helping it down.If a soccer ball is kicked with down spin, the opposite happens, but gravity will eventually pull it down.

result

This new kind of finesse inspired soccer players all over the world to start curving soccer balls into the net.It also brought nations and communities to watch this improved sport, while showing scientists what the human body can do.

Net forces in soccer

The force of gravity on players.The force of gravity on the soccer ball.The force of friction between the ball and the ground.The force of friction between the ball and the air.The forces of the players’ feet when they kick the ball.The force of the keepers’ body blocking the goal.The force of the net stopping the ball after the goal is scored.