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Forces and Newton’s Laws

Forces and Newton’s Laws. Houston, We Have a Problem! Lesson. Direct Forces. A force is a push or a pull . It is measured in Newtons (N). Newton’s First Law.

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Forces and Newton’s Laws

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  1. Forces and Newton’s Laws Houston, We Have a Problem! Lesson

  2. Direct Forces • A force is a push or a pull. • It is measured in Newtons(N)

  3. Newton’s First Law Law of Inertia –an object at rest will remain at rest or an object will continue at constant velocityuntil acted on by some outside force.

  4. Newton’s Second Law F = ma The acceleration of an object is directly proportional to the net force on it and inversely proportional to its mass.

  5. Newton’s Third Law For every action, there is an equal reaction in the opposite direction. Rocket boosters thrust down and the shuttle goes up!

  6. Free-Body Diagram: 1 Force Applied (Fa or Fthrust) FNet = Fa - Fo Force Opposing (Fo or Fgand Fdrag) ma = Fthrust - Fg - Fdrag The opposing force is the weight (or force due to gravity, Fg) and air drag of the rocket

  7. Free-Body Diagram: 2 The rocket is decelerating FNet = Fa - Fo Force Opposing (Fo or Fgand Fdrag) ma = 0 - Fg - Fdrag The opposing force is the weight, Fg, and air drag of the rocket.

  8. Free-Body Diagram: 3 Force Opposing (Fdrag) FNet = Fa - Fo ma = Fg - Fdrag Force Applied (Fg) The applied force is the weight, Fg

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