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Gravity And Motion

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Gravity And Motion

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Gravity And Motion

  1. 1. GRAVITY AND MOTION
  2. 3. Objectives… <ul><li>Explain the effect of gravity and air resistance on falling objects. </li></ul><ul><li>Explain why objects in orbit are in free fall and appear to be weightless. </li></ul><ul><li>Describe how projectile motion is affected by gravity. </li></ul>
  3. 4. GALILEO'S EXPERIMENT ON FALLING OBJECTS <ul><li>Galileo Galilei, who held a chair in mathematics at the University of Pisa, was impudent enough to question the common knowledge. The story has become part of the folklore of science: he is reputed to have dropped two different weights from the town's Leaning Tower showing that they landed at the same time. His challenges to Aristotle may have cost Galileo his job, but he had demonstrated the importance of taking nature, not human authority, as the final arbiter in matters of science. </li></ul>
  4. 6. Gravity and Acceleration <ul><li>The acceleration due to the gravity is the same for all objects. Why is this true? </li></ul><ul><li>A heavier object experiences a greater gravitational force thana a lighter object does. But a heavier objects is also more difficult to accelerate because it has more mass, this produces a balance. </li></ul>
  5. 7. Acceleration due to Gravity <ul><li>All the objects accelerate towards the Earth a rate of 9.8m/s/s. </li></ul><ul><li>So, for every second that an object falls, its velocity increases in 9.8 m/s. </li></ul>
  6. 9. Time (s) Velocity (m/s) 0 0 1 - 9.8 2 - 19.6 3 - 29.4 4 - 39.2 5 - 49.0
  7. 10. Can we calculate the velocity of a falling object? <ul><li>Of course we can, by using the followwing equation. </li></ul><ul><li>ΔV = g * t </li></ul>
  8. 11. AIR RESISTANCE AND FALLING OBJECTS <ul><li>As an object falls through air, it usually encounters some degree of air resistance. </li></ul><ul><li>The amount of air resistance depends on the size, shape and speed of the object. </li></ul>

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