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Newtons Laws

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					Newton’s Laws
     of
  Motion
     Explain the
First Law of Motion
Explain the First Law of Motion
• An object will not change its motion
  unless a force acts on it.
• An object that is not moving remains at
  rest until something pushes or pulls it.
• An object that is moving remains
  moving until something pushes or pulls
  it.
Explain the First Law of Motion
• The force that causes objects to slow
  down is FRICTION.
• Friction always acts opposite to the
  direction of motion.
• To keep an object moving when
  friction is acting on it, you have to
  keep pushing or pulling on the object
  to overcome the frictional force.
Explain the First Law of Motion
• All objects resist having their motion
  changed.
• This tendency to resist a change in
  motion is called inertia.
• The more mass an object has, the
  greater its inertia.
See Examples of the 1st Law of
       Motion Here:

http://www.jracademy.com/~mbastea
      f/newton/first/index.html
 Review the First Law here:


http://www.usoe.k12.ut.us/curr/scien
ce/sciber00/8th/forces/sciber/newto
              ns.htm
  More information about
Newton’s First Law of Motion
   may be found here:
 http://www.beyondbooks.com/psc91
              /4a.asp
     Explain the
Second Law of Motion
Explain the Second Law of Motion

• A change in motion occurs only if a
  net force is exerted on an object.
• A net force changes the velocity of the
  object, and causes it to accelerate.
  Explain the Second Law of Motion
• If an object is acted upon by a net force, the
  change in velocity will be in the direction of
  the net force.
• Acceleration can be calculated from the
  formula:
  Explain the Second Law of Motion
• The acceleration of an object depends
  on its mass.
• The more mass an object has or the
  more inertia it has, the harder it is to
  accelerate.
• More mass means less acceleration if the
  force acting on the objects is the same.
  Explain the Second Law of Motion
• If a stands for the acceleration, Fnet for the
  net force, and m for the mass, this formula
  can be written as follows:


• In this formula the force is in newtons, the
  mass is in kilograms, and the acceleration is
  in meters per second squared.
See Examples of the 2nd Law of
       Motion Here:


http://www.jracademy.com/~mbastea
     f/newton/second/index.html
Review the Second Law here:

http://www.usoe.k12.ut.us/curr/scien
ce/sciber00/8th/forces/sciber/newto
              n2.htm
More information about Newton’s
 Second Law of Motion may be
          found here:

 http://www.beyondbooks.com/psc91
              /4d.asp
    Explain the
Third Law of Motion
Explain the Third Law of Motion
• When one object exerts a force on a
  second object, the second object exerts
  an equal force in the opposite direction
  on the first object.
• The force exerted by the first object is
  the action force.
• The force exerted by the second object
  is the reaction force.
See Examples of the 3rd Law of
       Motion Here:


http://www.jracademy.com/~mbastea
      f/newton/third/index.html
Review the Third Law here:

http://www.usoe.k12.ut.us/curr/scien
ce/sciber00/8th/forces/sciber/newto
              n3.htm
  More information about
Newton’s Third Law of Motion
    may be found here:

http://www.beyondbooks.com/psc91
             /4f.asp

				
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