newton's law of motion


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newton's law of motion

  1. 1. Aristotle's Theories of Motion
  2. 2. <ul><li>Nothing moves unless you push it.  [it is moved by a mover] </li></ul><ul><ul><li>Some motion is natural for the sublunar elements, rectilinear motion to or away from the earth's center for the supralunar quintessence, circular motion </li></ul></ul><ul><ul><li>All other motion is violent, and requires a mover </li></ul></ul><ul><ul><ul><li>[Anselm's nth proof of the existence of God] </li></ul></ul></ul><ul><ul><ul><li>Because motion exists, there must be a self-moved mover, i.e. a Prime Mover [later i.d. God] </li></ul></ul></ul>
  3. 3. There is natural, violent, and local motion; rectilinear and circular motion Speed is proportional to motive force, and inversely proportional to resistance. F/R   [by a constant of proportionality: v = k(F/R)] There cannot be a vacuum [therefore Natura is a plenum] The most Natural state:  Rest [if terrestrial] Teleology  -  The 4th and Final Cause  -- &quot;WHY&quot; is the most  important question. [Aristotle's Theory of Causation ]
  4. 4. Galileo Galilei’s Theories of Motion
  5. 5. The Law of Fall
  6. 6. <ul><li>During the first decade of the 17th century, Galileo began conducting experiments and working with various precise measurements in the search for mathematical equations capable of describing the movement of bodies. Galileo's use of mathematics and experimentation for physical research were one of the central innovations of his scientific activity. </li></ul>
  7. 7. <ul><li>Galileo was deeply influenced by Archimedes principles of statics (the theory of equilibrium) which he expanded on for his discussion of moving bodies. Through his use of mathematics and physical experimentation, Galileo was able to formulate the Law of Fall in 1604, which is related to the Law of Inertia which he first formulated in 1612. These laws stand in marked contradiction to Aristotelian physics and all that was accepted up to then. From this period on, Galileo made distinct efforts to refute Aristotelian theory. </li></ul>
  8. 9. SIR ISAAC NEWTON <ul><li>English physicist and </li></ul><ul><li>mathematician, goes the credit for being the first to introduce the concepts of mass and force in mechanics and to formulate the laws governing motion . These laws are commonly called Newton’s laws of motion and constitute the principles of dynamics. </li></ul>
  9. 10. Newton’s 1 st Law: THE LAW OF INERTIA
  10. 11. Inertia <ul><li>-property of matter to resist change in its state of rest or uniform motion. </li></ul>
  11. 12. Law of Inertia <ul><li>An object that is not moving will not move until a net force acts upon it. </li></ul><ul><li>Example: </li></ul><ul><li>A clock will remain at rest on the table unless a net force acts upon it. </li></ul>
  12. 13. <ul><li>An object that is in uniform motion moves in the same direction and at the same speed unless an external unbalanced force acts on it. </li></ul><ul><li>Example: </li></ul><ul><li>A man riding a horse is </li></ul><ul><li>thrown in front of the horse </li></ul><ul><li>when it stops suddenly. </li></ul>
  13. 14. Newton’s 2 nd Law: The Law of Acceleration
  14. 15. Law of Acceleration <ul><li>States that the acceleration of an object is directly proportional to, and in the same direction as, the net force and is inversely proportional to the mass. </li></ul>
  15. 16. <ul><li>Formula: </li></ul><ul><li>a = F/m </li></ul><ul><li>where F is the resultant force acting on the body, m is the mass of the body, and a is its acceleration . </li></ul>
  16. 17. <ul><li>Example: </li></ul>
  17. 18. Newton’s 3 rd Law: The Law of Interaction
  18. 19. Law of Interaction <ul><li>States that whenever two bodies interact, the forces they exert on each other are equal in magnitude but opposite in direction. </li></ul>
  19. 20. <ul><li>Example: </li></ul><ul><li>The bullet and the gun. </li></ul><ul><li>(the acceleration of the bullet is much greater than that of the gun although the action and the reaction forces are equal.) </li></ul><ul><li>Explaination: </li></ul><ul><ul><li>When you fire a gun, </li></ul></ul><ul><ul><li>you are exerting a force. </li></ul></ul><ul><ul><li>The bullet moves forward </li></ul></ul><ul><ul><li>and the reactional force is, the gun </li></ul></ul><ul><ul><li>moves backward. </li></ul></ul>
  20. 21. Comar, Charmaine Marie - Leader Bellingan, Lloyd - Asst. Leader Members: Gabriel, Louise Guarisma, Germaine Villar, Kevin Campos, Ana Aying, Jumari