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# 12 2 Newtons 1st 2nd Laws Of Motion

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• 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