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# The Physics of Soccer

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## Joseph Houdeshell

on 13 May 2014

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#### Transcript of The Physics of Soccer

The Physics of Soccer
By Carlos Alvarez and Joseph Houdeshell

Collisions
An instance of one moving object or person striking violently against another.
In soccer, there are a large number of collisions taking place. When a collision occurs, a force is transferred from one object to another. (In soccer this happens between players and between a players foot and the ball).
Most collisions in soccer are of the elastic nature, as the objects bounce of each other.
(Like when Cameron Spencer broke that kids leg, that was an elastic collision.)
Projectile motion
Projectile motion is a form of motion in which an object or particle (called a projectile) is thrown near the earth's surface, and it moves along a curved path under the action of gravity only. The only force of significance that acts on the object is gravity, which acts downward to cause a downward acceleration.
The factors that affect the soccer ball are gravity, air resistance, and the weight of the ball. All play an important role in the principles of projectile motion.
The angle of how the soccer player kicks the ball also determines the height and distance it travels. For example, if the ball is kicked at an angle of 45 degrees it will obtain the maximum distance. It also affects the vertical and horizontal velocity of the ball.
Friction
the resistance that one surface or object encounters when moving over another.
When a soccer ball moves along the turf, there is a component of force that is parallel to the turf. This parallel force is called a frictional force.
Frictional forces are tangent to the surface an object is traveling on. A soccer ball moving across a field creates friction, which is opposite the direction the ball is traveling.
The more friction there is between the ball and the field, the slower the ball will move over the field.
Conclusion
Soccer is the most popular/coolest sport ever.
(it is all about physics and we just love physics)
Aerodynamics
the study of the properties of moving air, and especially of the interaction between the air and solid bodies moving through it.
Sometimes during play, one may be required to make the ball curve around opponents. The closer the air is to the center of the ball, the faster it travels.
According to Bernoulli’s principle, the pressure on an object (in this case the ball) can be reduced if the object is rotating the same way as the airflow. Bernoulli’s principle says that “when speed is high, pressure is low”, and vice versa.
When the pressure is low on one side of the ball, the other side has higher pressure and this difference of the pressures of the two sides of the ball causes the ball to swerve to one side (basically the ball curves).
To curve the ball, it must be initially kicked off-center to create a side spin. If the ball is kicked with high velocity, it will enter a smooth-airflow help to bring in a large sideways force.
Vector Motion
Drag
Newtons Laws of Motion
A quantity having direction as well as magnitude, especially as determining the position of one point in space relative to another.
When a ball is kicked it is considered to have direction and magnitude making it a vector.
The force applied to a ball when striking it also is an example of vector motion.
Drag refers to forces acting opposite to the relative motion of any object moving with respect to a surrounding fluid.
If we move with the ball through the air, the ball appears to be motionless and the air moves past the ball at the velocity of the ball. Next to the surface of the ball, the particles of the air stick to the surface. This thin layer of particles pulls on the surrounding flow of air creating drag.
Drag causes a soccer ball to slow down in flight and have a parabolic motion.
I. Every object in a state of motion tends to remain in that state of motion unless an external force is applied to it.
When a soccer ball is in motion, it will stay in motion. When a soccer ball is at rest, it will stay at rest.
II. The relationship between an object's mass (m), its acceleration (a), and the applied force (F) is F=ma.
The acceleration of a kicked ball depends on how hard the kick was divided by the mass of the ball
III. For every action there is an equal and opposite reaction.
When a soccer ball is kicked, the kicker experiences the same amount of force the ball experiences
Momentum
the quantity of motion of a moving body, measured as a product of its mass and velocity.

Have you ever wanted to know how soccer players trap the ball so effortlessly? Well, its all about timing. Instead of just stopping the ball by putting their foot out, they move with the ball, which slows the
momentum
down. They trap the ball by slowing resisting it, instead of quickly blocking it.

Works Cited
"Drag on a Soccer Ball." Drag on a Soccer Ball. N.p., n.d. Web. 24 Apr. 2014.
"Newton's Three Laws of Motion." Newton's Three Laws of Motion. N.p., n.d. Web. 21 Apr. 2014.
"PHYSICS." : Unit 7: Collisions in Soccer. N.p., n.d. Web. 24 Apr. 2014.
"The Physics of Soccer." The Physics of Soccer. N.p., n.d. Web. 24 Apr. 2014.
"Physics of Soccer." The Science Classroom. N.p., n.d. Web. 19 Apr. 2014.
"The Wonderful World of Physics." : How Are the Principles of Projectile Motion Applied in Soccer? (team). N.p., n.d. Web. 24 Apr. 2014.
Quiz!!!!!
1) According to Bernoulli’s Principle, when speed is high pressure is what?
2) What creates drag on a moving soccer ball?
3) When Cameron Spencer broke that kid’s leg, what type of collision was it?
4) Which one of Newton’s Laws of Motion does the following statement reflect: When a soccer ball is kicked, the kicker experiences the same amount of force the ball experiences?
This years world cup ball
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