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Gravity and Free Fall

Gravity and Free Fall. Gravity and Free Fall. What would happen if you dropped a baseball out a second-floor window?. Gravity and Free Fall. Describe the speed of the baseball, at the beginning when you let it go, and at the end when it hits the ground. Gravity and Free Fall.

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Gravity and Free Fall

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  1. Gravity and Free Fall

  2. Gravity and Free Fall What would happen if you dropped a baseball out a second-floor window?

  3. Gravity and Free Fall Describe the speed of the baseball, at the beginning when you let it go, and at the end when it hits the ground

  4. Gravity and Free Fall Is the speed of the baseball constant or does it accelerate? If it accelerates, at what rate? Do ALL objects fall at the same rate?

  5. Gravity and Free Fall Free fall – an object is in free fall if it is accelerating due to the force of gravity and NO other forces are acting on it *a ball thrown upward is also in free fall after it leaves your hand

  6. Gravity and Free Fall Acceleration due to gravity – Objects on Earth accelerate downward at 9.8 m/s2 In physics, this value is represented by the letter g

  7. Gravity and Free Fall Acceleration due to gravity g = 9.8 m/s2

  8. Gravity and Free Fall What does an acceleration of 9.8m/s2 really mean? What is happening to the speed?

  9. Gravity and Free Fall Upward Launches

  10. Gravity and Free Fall When an object is in free fall, it accelerates downward at 9.8 m/s2. Gravity causes the acceleration by exerting a downward force. So what happens if you throw a ball upward?

  11. Gravity and Free Fall The ball will slow down as it moves upward, come to a stop for an instant, and then fall back down

  12. Gravity and Free Fall As it moves upward, the speed decreases by 9.8 m/sec every second until it reaches zero. The ball then reverses direction and starts falling down. As it falls downward, the speed increases by 9.8 m/sec every second.

  13. Gravity and Free Fall In this picture, the ball’s initial velocity is +19.6 m/sec and its velocity four seconds later is -19.6 m/sec. How come?

  14. Gravity and Free Fall What is the ball’s speed after 2 seconds, at the top? What is the ball’s acceleration after 2 Seconds at the top?

  15. Gravity and Free Fall By how much does the speed of an object in free fall change each second?

  16. Gravity and Free Fall A ball is thrown straight up into the air. As it moves upward, its speed _________ by _____ each second. As it falls back down, its speed ________ by____ each second.

  17. Gravity and Free Fall What is the difference between speed and velocity?

  18. Gravity and Free Fall Now let’s do some calculations!

  19. Gravity and Free Fall The rate of acceleration due to gravity, 9.8m/s2 is the same for all objects, and is always 9.8m/s2 on the Earth’s surface. So…

  20. Gravity and Free Fall Using this formula, the height an object falls (displacement), or the time it is in free fall can be calculated if one of those variables is given

  21. Gravity and Free Fall

  22. Gravity and Free Fall If you are given the time an object is in free fall, you can calculate how far it fell, or if you are given the height it fell, then you can calculate the time it took to fall.

  23. Gravity and Free Fall Let’s make this formula easier to use if a free falling object starts at rest.

  24. Gravity and Free Fall

  25. Gravity and Free Fall You drop a ball from the edge of a cliff. It lands 4 seconds later. What distance does the ball fall during the 4 seconds?

  26. Gravity and Free Fall A stone tumbles into a mine shaft and strikes bottom after falling for 47.3 seconds. How deep is the mine shaft?

  27. Gravity and Free Fall The climber dropped her compass at the end of her 240-meter climb. How long did it take to strike bottom?

  28. A tennis ball is thrown straight up with an initial speed of 20.5 m/s. It is caught at the same distance above ground as it is thrown. How high does the ball rise? How long does it take for the ball to reach it’s maximum height?

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