S: Gravity and Acceleration
Gravity April 8, 2008
Aristotle <ul><li>Ancient Greece around 400 BC </li></ul><ul><li>He believed that the heavier the object, the faster it fa...
<ul><li>In the late 1500s, an Italian scientist named  Galileo  Galilei decided to prove Aristotle wrong. </li></ul><ul><l...
 
Elephants & feathers <ul><li>Objects fall to the ground at the same rate because  acceleration  due to gravity is the same...
What is gravity? Galileo and Newton helped us understand  gravity  as a force that exists between the Earth and objects. N...
It all starts with an apple… <ul><li>Isaac  Newton  1655  </li></ul>
<ul><li>The size of the gravitational force depends on two things: </li></ul><ul><ul><li>Mass  of the objects </li></ul></...
What is weight? <ul><li>Weight is a measure of the  gravitational force  exerted on an object. </li></ul><ul><li>Since gra...
Gravity & Acceleration <ul><li>The rate at which objects accelerate towards Earth is  9.8 m/s 2 . </li></ul><ul><li>This a...
Air Resistance <ul><li>The amount of air resistance depends on the  size  and  shape  of an object. </li></ul><ul><li>Whil...
Free Fall <ul><li>When there is no air resistance, an object is in  free fall. </li></ul><ul><li>An object is in free fall...
 
Terminal Velocity <ul><li>Force of gravity = air resistance </li></ul><ul><li>This is the highest velocity reached by a fa...
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Gravity

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  • Gravity

    1. 1. S: Gravity and Acceleration
    2. 2. Gravity April 8, 2008
    3. 3. Aristotle <ul><li>Ancient Greece around 400 BC </li></ul><ul><li>He believed that the heavier the object, the faster it falls. </li></ul>
    4. 4. <ul><li>In the late 1500s, an Italian scientist named Galileo Galilei decided to prove Aristotle wrong. </li></ul><ul><li>Galileo theorized that all objects will land at the same time when they are dropped from the same height . </li></ul>
    5. 6. Elephants & feathers <ul><li>Objects fall to the ground at the same rate because acceleration due to gravity is the same for all objects. </li></ul>
    6. 7. What is gravity? Galileo and Newton helped us understand gravity as a force that exists between the Earth and objects. Newton showed that the same force exists between all objects. Even today, no one knows exactly why objects attract each other.
    7. 8. It all starts with an apple… <ul><li>Isaac Newton 1655 </li></ul>
    8. 9. <ul><li>The size of the gravitational force depends on two things: </li></ul><ul><ul><li>Mass of the objects </li></ul></ul><ul><ul><li>Distance between the objects </li></ul></ul>The Law of Universal Gravitation
    9. 10. What is weight? <ul><li>Weight is a measure of the gravitational force exerted on an object. </li></ul><ul><li>Since gravity is a force and weight is a measure of gravity, weight is expressed in newtons (N). </li></ul>
    10. 11. Gravity & Acceleration <ul><li>The rate at which objects accelerate towards Earth is 9.8 m/s 2 . </li></ul><ul><li>This acceleration is the same for all objects, regardless of their mass. </li></ul>
    11. 12. Air Resistance <ul><li>The amount of air resistance depends on the size and shape of an object. </li></ul><ul><li>While gravity pulls an object down, towards the Earth, the air resistance pushes an object up, or away from the Earth. </li></ul>
    12. 13. Free Fall <ul><li>When there is no air resistance, an object is in free fall. </li></ul><ul><li>An object is in free fall only if gravity is pulling it down and no other forces are acting on it. </li></ul>
    13. 15. Terminal Velocity <ul><li>Force of gravity = air resistance </li></ul><ul><li>This is the highest velocity reached by a falling object thus it has 0 acceleration and falls with constant velocity. </li></ul>

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