Forces & Newton�s Laws of Motion by ee3kYaGM

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									Newton’s First
Law of Motion

     Chapter 3
     Section 2
    Newton’s First Law of Motion
• Sir Isaac Newton (1642 – 1727) was able to
  state rules describing the effect of forces on
  motion of objects that are still true today.
• These rules are known as:
     Newton’s Laws of Motion

• Newton’s First Law of Motion is also called
     The Law of Inertia
    Newton’s First Law of Motion
• An object moving at a constant velocity
  keeps moving at that velocity unless a
  net force acts on it.
• If an object is at rest, it will stay at rest,
  unless a net force acts on it.
• If an object is in motion, it will stay in
  motion, unless a net force acts on it.
Newton’s First Law of Motion
     What Happens in a Crash?




• Newton’s Law First Law of Motion
• If you are traveling at 50 kilometers per hour
  and you hit a tree…
     What Happens in a Crash?


• If you are not wearing your seatbelt…
• The car is stopped by the tree and you
  continue to move forward at a speed of 50
  kilometers per hour until you hit the
  dashboard, steering wheel, windshield, etc.
• You would hit at the same speed you would
  reach if you fell from a three-story building.
     What Happens in a Crash?

• If you are wearing your seatbelt…
• The seatbelt loosens a little upon impact and
  will hold you.
• This allows your body to be slowed down
  gradually and decreases the unbalanced
  force placed on your body.
• The seatbelt could also save you from being
  thrown outside the car.

								
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