Chapter 17-Newton

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Chapter 17-Newtons Laws

• Gravity and Motion-The acceleration due to
  gravity is the same for all objects on Earth
  this is 9.8 m/s/s
• Air resistance (fluid friction) slows down this
  acceleration
• Terminal velocity the object falls at a constant
  velocity and stops speeding up.

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1st Law of Motion

• An object at rest or in motion will continue in
  that way until another force acts upon it.
• Example Bowling pins will continue to sit at
  the end of the alley until someone rolls a
  bowling ball into them, knocking them down

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2nd Law of Motion

• An object acted upon by a force will accelerate
  in the direction of that force.
• anet force/mass
• Force measured in N, or 1 kg m/s2
• Example If you are pushed on a swing, you go
  forward, the direction of the push. Gravity
  brings you backwards, the direction of its pull.

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3rd Law of Motion

• For every ACTION, there is an opposite and equal
  REACTION.
• You push on a wall, it pushes back at you with
  equal force. So, if you walk into a glass door
  you didnt realize was there, you definitely know
  it. ?
• Other examples Pushing with your feet off the
  diving board pushing a canoe paddle through
  water a rocket launching from the earth.

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