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Free Fall

Free Fall . Acceleration due to Gravity. Acceleration Due to Gravity. http:// www.youtube.com/watch?v=LgKzj4V3zmU&t=26s The acceleration of an object in free fall that results from the effect of Earth’s gravity .

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Free Fall

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  1. Free Fall Acceleration due to Gravity

  2. Acceleration Due to Gravity • http://www.youtube.com/watch?v=LgKzj4V3zmU&t=26s • The acceleration of an object in free fall that results from the effect of Earth’s gravity. • Near the surface of the earth, objects acceleration downward at a rate of 9.8 m/s2 • As you move farther from the Earth’s surface, this decreases. • If object is dropped from a stationary postion, the initial velocity is 0 and g = +

  3. Air Resistance • Form of friction that prevents objects from falling at the same rate. • Removal of air would result in objects falling at the rate. • http://www.youtube.com/watch?v=03SPBXALJZI

  4. Objects Launched Upward • Since the object’s initial motion is up, the direction “up” would be positive. • Acceleration due to Gravity = -g • At the highest point, the object has a velocity of 0

  5. Sample Problem • An object falls from the top of a building for 1.5 s after starting at rest. • What is it’s velocity? • How tall is the building? • Known • A = -g = -9.8 m/s2 • d0 = 0 • v0 = 0 • d = ? • v = ?

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