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Free Falling Bodies
The document explains the concept of free fall, emphasizing that all bodies fall with the same acceleration due to gravity when air resistance is neglected. It discusses the effects of gravity on acceleration and references kinematic equations to solve problems related to the motion of falling objects. The text includes examples that require calculations of height, time, and velocity related to free fall scenarios.
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Free Falling Bodies
- 2. F R EE F A L L
- 3. F R EE F A L L
- 4. In the absenceof air resistance… All bodies regardless of SIZE and WEIGHT It is found that at the same location above the earth’s surface fall VERTICALLY with the SAME ACCELERATION.
- 5. In the absenceof air resistance… All bodies regardless of SIZE and WEIGHT It is found that at the same location above the earth’s surface fall VERTICALLY with the SAME ACCELERATION.
- 7. -is the motionof a body acted upon by gravitational pull only. -motion that is free from other forces except the gravitational force due to the earth.
- 8. Imagine a straightnumber line that coincides with the motion. Choose an origin. Assign one direction as the positive axis. The position of a falling object is specified by the y- coordinate of its location.
- 9.
- 10. EACCEL RATION How doesgravity affect acceleration? gravity /is/ acceleration! You've probably heard of the "force of gravity," and you may have heard of the equation “F=ma.” The thing about gravity is that it has its own number… In a sense,
- 11. EACCEL RATION How doesgravity affect acceleration? gravity /is/ acceleration! You've probably heard of the "force of gravity," and you may have heard of the equation "F=ma." The thing about gravity is that it has its own number… In a sense,
- 12.
- 13. Use the formulafrom kinematic equation… Change x = y a = -g
- 14. Use the formulafrom kinematic equation… Change x = y a = -g
- 15. x = ya = -g
- 16. It takes 2.00seconds for a pebble released from the top of a building to reach the ground. How tall is the building? 12seconds m = ?
- 17. t = 2.00seconds g = -9.8 m/s^2 = 0 m/s y = ? (how tall?)
- 18. m m/s What time doesthe ball reach its maximum height?
- 19. m m/s What is thevelocity of the ball when it returns to its original height?
- 20. m m/s What is the maximumheigth of the ball?
- 21. a. How tall? b.What is the final velocity?
Editor's Notes
- #11 In a sense, gravity /is/ acceleration! You've probably heard of the "force of gravity," and you may have heard of the equation "F=ma." What this equation means is that the force on an object is the same as the mass of the object multiplied by how much it's being accelerated. The thing about gravity is that it has its own number for the "how much it's being accelerated" part, and that number is the same pretty much anywhere on a planet. For gravity on the Earth, that number is about 9.81 (m/s^2).