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Free fall

Free fall. Objects that fall under the influence of gravity and are heavy enough to neglect air resistance . The speed of the ball increases 9.8m/s every second because g = 9.8m/s 2. v t.

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Free fall

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  1. Free fall Objects that fall under the influence of gravity and are heavy enough to neglect air resistance.

  2. The speed of the ball increases 9.8m/s every second because g = 9.8m/s2 • v • t

  3. Falling from rest • d • t

  4. What does motion map of object being thrown upward look like?

  5. A juggler is juggling two oranges on the top of a high wire. One orange he throws downward at a speed of 1.5 m/s and one he throws upward at a speed of 1.5 m/s. Which orange will hit the ground first? Which orange will have a faster speed right before hitting the ground?

  6. Free fall where the earth is the reference point Position vs time Velocity vs time

  7. Comparing earths and the moons Free fall • Moon g = 1.6 m/s2 • Thefirst second • The ball has fallen • .8 m and at 1.6 m/s2 • After three seconds the • ball has fallen 7.2m • and is moving at a speed of 4.8 m/s • Earth g = 9.8 m/s 2 • The first second • The ball has fallen • 4.9 m • And is moving 9.8 m/s • After three seconds • The ball has fallen 44.1m and is moving at 29.4m/ s

  8. An object falls from rest for 10 seconds • A. What is its final velocity? • B. How far has it fallen?

  9. An object is thrown upward with a speed of 15 m/s on the surface of the moon where the acceleration due to gravity is 1.6 m/s2 • A. What is the maximum height reached by the object? • B. How long does it take for the object to reach its maximum height? • C. How long does it take for the object to return to where it was thrown? • D. What is the object’s speed after 2.0 seconds?

  10. A bullet is shot straight up on earth and returns to its starting point in 4.8 seconds. What is the speed of the bullet?

  11. Effects of air resistance (Drag) • Acceleration decreases to zero • Velocity reaches a constant velocity called Terminal velocity. • Video 1 • Video 2

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