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# 12 2 Newtons 1st 2nd Laws Of Motion

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### 12 2 Newtons 1st 2nd Laws Of Motion

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