text: Document Sample
  
  ```					“Do noW” TemplaTe             TAPE the note sheet you were
  handed at the door into pg. of
  The ancient Greeks concluded that it was
  necessary to apply a continuous force to
  keep an object in motion.
  For example, if you set a book on a table and
  give the book a quick push, the book slides
  a short way then stops. To keep the book
  moving, you need to keep pushing it.
  The Greeks reasoned that the book stops
  moving because you stop pushing it.
  QUESTION
  Based off of information you have learned, write a brief
  paragraph letter to the Greeks, explaining what scientists
  have discovered to help the Greeks understand why the book
  stops moving.
  A puck is moving on an
  air-table. If the table is
  so large that the puck
  never hits an edge, what
  will happen to the puck?
  A      It will never stop.
  
  B      It will stop in a short
  distance.
  C      It will speed up.
  Galileo’s Thought Experiment
  
  • Galileo thought of a different way to explain
  the observation of the motion of the book.
  • He imagined a world without friction and
  conducted an experiment.
  
  I doubt the Greeks’
  idea! Suppose…
  Galileo’s Thought Experiment
  
  The rail is
  horizontal…
  
  If ball-bearing is   No force is needed to
  released here…       keep the ball-bearing
  moving.
  …it will never rise up,
  and will move at
  constant speed.
  horizontal rail
  Galileo’s Thought Experiment
  
  – In the absence of friction, a moving object will
  continue moving even if there is no force acting
  on it.
  – In other words it does not take a force to keep an
  object moving, it takes a force – friction – to stop
  an object that is already moving.
  Newton’s 1st Law of Motion
  Description
  
  Objects at rest remain at
  rest, and objects in motion
  remain in motion with the
  same velocity, unless acted
  upon by an unbalanced
  force.
  Newton’s 1st Law of Motion
  LAW
  Newton’s 1st Law of Motion
  
  Inertia: Tendency of an
  object to resist changes in
  motion.
  mass       inertia          Mass of an object is
  resistance to             a measure of its
   start to move from rest        inertia.
   change moving speed
  Which Has More Inertia?
  Which is harder to push, pull, turn, or stop?!?
  Newton’s 1st Law of Motion
  Everyday Examples
  
  Unbalanced Force
  
  Unbalanced Force
  
  Object in Motion
  Object at Rest
  Activity: (Name of Activity Station)
  
  Observations:
  
  Newton’s 1st Law!)
  Exit Ticket
  A ball is at rest on the floor of a car moving at a
  constant velocity. What will happen to the ball
  if the car swerves suddenly to the left?
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