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Physics of soccer

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Physics of soccer – PowerPoint PPT presentation

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Title: Physics of soccer


1
Physics of soccer
2
Topics
  • Newton's Laws of physics
  • Mass
  • Velocity
  • Acceleration
  • Inertia
  • Momentum
  • Kinetic Energy
  • Potential Energy
  • Gravity

3
Definitions
  • ACCELERATION - change in velocity divided by the
    time interval over which it occurred,
    acceleration is positive if the velocity change
    is positive. a v/t
  • GRAVITY - affects weight (acceleration due to
    gravity) (g), a vector quantity having both
    magnitude and direction, a freely falling object
    has an acceleration of -9.8 m/s2

4
  • VELOCITY - ratio of change in position to time
    interval over which change takes place, includes
    speed and the algebraic sign or direction, it can
    be negative or positive, measured in meters per
    second (m/s). v d/t
  • WEIGHT - measured in Newton's (N), force of
    gravity on an object, depends on the acceleration
    due to gravity.

5
  • MASS - measured in kilograms (kg), amount of
    matter an object contains, mass is constant for
    any object.
  • MOMENTUM - product of object's mass and velocity,
    vector quantity that has the same direction as
    the velocity of the object, measured in kilogram
    meter per second. (kg-m/s)  p mv

6
Newton's First Law
  • Newton's first law states that an object in
    motion will remain in motion unless acted upon by
    an outside force an object at rest will stay at
    rest unless acted upon by an outside force. 

7
Mass
  • When force is applied to the ball it is
    accelerated into motion, but also mass of the
    ball counts. The mass of a ball is probable 400
    grams. Also with out gravity the ball would stay
    in the air forever and drag.

8
Inertia
  • Inertia property of mass and it cannot change.
    The ball has very little inertia because it is
    small so it is easy to stop it once it is
    moving. A small net force is required to change
    its speed.

9
Energy's and momentum
  • When you kick a soccer ball you are using
    energy, both potential and kinetic. As the
    player's foot accelerates into the ball, two laws
    come into effect The conservation of energy and
    the conservation of angular momentum. If no
    energy was let off, the speed of the ball would
    be exactly twice that of the foot .
  • The ball is struck as close to the legs maximum
    velocity as possible so really, the ball
    bounces off of the moving foot for a finite
    distance. The momentum of the foot goes into the
    ball, giving the ball a velocity.

10
Newton's Second Law
  • Newton's second law states that the acceleration
    of an object is directly proportional to the net
    force acting on it and inversely proportional to
    its mass.  This can be very easily be stated
    using the equation Fma. In this case F is the
    net force, m is the mass of the object, and a is
    the acceleration of the object. 

11
  • This can be seen when you kick the ball, the more
    force you use to move the ball the greater the
    acceleration of the ball. So the greater the
    mass the more force it will take.

12
Newton's third law
  •    Newton's Third Law of Motion states that for
    every action there is a an equal and opposite
    reaction.    

13
  •   Every time you go to kick the ball this law
    comes into effect.  You may not realize this
    because we are so massive compared to the ball
    that we do not realize that the ball actually
    pushes back on our foot as we push against it.   

14
Sources
  • www.uncedu/uncrani/soccer1.htm
  • www.footy4kids.co.uk/soccer-physics.htm
  • http//www.sparknotes.com/physics/dynamics/newtons
    threelaws/section1.html
  • Date 10/18/o8
  • This sources really help me a lot to better
    understand physics. To tell you the truth it
    really bothers me that I got this stuck in my
    head, now when I play soccer I will always think
    of physics.

15
Painful /funny soccer
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