Transcript Physics of Soccer

Physics of soccer
Topics
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Newton's Laws of physics
Mass
Velocity
Acceleration
Inertia
Momentum
Kinetic Energy
Potential Energy
Gravity
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/s^2
 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.
 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
Newton's First Law
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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.
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.
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.
Energy's and momentum
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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 .
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The ball is struck as close to the leg’s
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.
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:
F=ma. In this case F is
the net force, m is the
mass of the object, and a
is the acceleration of the
object.
 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.
Newton's third law
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Newton's Third
Law of Motion states
that for every action
there is a an equal
and opposite
reaction.
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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.
Sources
 www.uncedu/uncrani/soccer1.htm
 www.footy4kids.co.uk/soccer-physics.htm
http://www.sparknotes.com/physics/dynamics
/newtonsthreelaws/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.
Painful /funny soccer