12 2 Newtons 1st  2nd Laws Of Motion
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Transcript

  • 1. NEWTON’S 1 st & 2 nd Laws of Motion Ch 12-2
  • 2. Aristotle, Galileo, and Newton
    • Took about 2000 years to develop relationship between force and motion.
  • 3. Aristotle
    • Greek Philosopher. 384-322BC .
    • Scientific discovery made through observation and logical reasoning.
    • Error in theory delayed progress on motion theory 2000 yrs.
    • The Error: Force is required to keep an object moving at constant speed.
  • 4. Galileo
    • Theory: Gravity produces constant acceleration
    • Used experiments to draw conclusion
    • Major experiment:
    • Rolled balls down a ramp and predicted that objects remain in motion unless friction slows them
  • 5. Newton
    • First defined mass and force .
    • 1 st Law.
    • The state of motion of an object does not change so long as the net force on the object is zero.
    • English: An object at rest will remain at rest until another force act on it.
  • 6. Newton
    • Inertia=
    • Is the tendency of object to resist change in its motion.
    • Object at rest stays at rest
    • Object in motion stays in motion—same direction and speed
  • 7. 2 nd Law
    • Acceleration = Net force(F) / Mass (m)
    • a = F net / m or F net = m * a
    • Force = mass X Acceleration
    • Mass = is a measure of inertia an object has and depends on the amount of matter the object contains
  • 8. 2 nd Law
    • The ratio is specific in that a doubling of an objects mass will cut its acceleration in half.
  • 9. Weight and Mass
    • Weight(w) is the force of gravity(g) acting on an object.
    • Weight = mass X 9.8m/s 2 Or W=mg
    • Other forms:
    • m= W / g and g= W/ m
    • Mass is the measure of the inertia of an object
  • 10.
    • http://www.glenbrook.k12.il.us/gbssci/phys/Class/newtlaws/u2l3a.html