Inertia Newton

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InertiaNewtons First Law

• Dayna Lee Martínez
• STARS - USF
• Maniscalco Elementary

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Newton's First Law
An object at rest tends to stay at rest and an
object in motion tends to stay in motion with the
same speed and in the same direction unless acted
upon by an unbalanced force.
What does that means?
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It means that
An object in motion wants to stay in motion, and
an object at rest wants to stay at rest.
This is also called INERTIA
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The car is at rest, and it is going to stay at
rest
until a force gives it a push.
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Now that is moving, it will continue to move
until another force stops it.
Friction
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The best place to test inertia is in Space, why?
In outer space there is no air, or anything else
to create friction. So moving objects will keep
moving forever, and objects that aren't moving
will stand still forever.
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Always wear your seatbelt!

• The crash dummy is not wearing a seat belt and is
  moving along with the car.
• Both the car and the dummy are moving at, say 60
  mph. 
• When the car hits the cement road divider, it is
  stopped (an outside force stops it from moving). 
  
• The crash dummy, however is not so lucky.  Since
  he is not wearing a seat belt and is not
  connected to the car, he will continue to move at
  60 mph.  This means he will go flying out through
  the front windshield.
• The dummy will fly through the air until he hits
  the ground. 
• This is because the earth's gravity stopped him
  from moving any further. 
• If this collision had happened in zero-gravity,
  in a vacuum, the dummy would theoretically keep
  on hurtling away from the car at 60 mph.

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Lab Activity Sheep in a Jeep