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1-D Projectile Motion

1-D Projectile Motion. First Some Definitions. – An object that only has the force of gravity acting on it. - path a projectile travels through space. - highest point reached along a trajectory. Free Body Diagram. Hint: Remember the definition of a projectile. Free Body Diagram. F w.

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1-D Projectile Motion

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  1. 1-D Projectile Motion

  2. First Some Definitions • – An object that only has the force of gravity acting on it.

  3. - path a projectile travels through space

  4. -highest point reached along a trajectory

  5. Free Body Diagram Hint: Remember the definition of a projectile

  6. Free Body Diagram Fw Hint: Remember the definition of a projectile

  7. Does the ball travel the same distance every second?

  8. Does the ball travel the same distance every second? No. The ball travels per second as it falls.

  9. Is the ball’s velocity constant as it falls?

  10. Is the ball’s velocity constant as it falls? No, It by 10 m/s every second

  11. So…... is the acceleration constant?

  12. Yeah … a = -10 m/s2 the whole time

  13. We can find the velocity at any time vft If **if in free fall, a is the acceleration due to gravity (g) (a =g = 10m/s2)

  14. Now to find the distance… The distance increases as the square of the time

  15. Problems • A 3-kg watermelon is dropped off the Sundial restaurant in downtown Atlanta. It takes 3 seconds to hit the ground. • What is the velocity of the watermelon on impact? • How far had the watermelon fallen by the 2nd second? • How tall is the Sundial restaurant? • What is the weight of the watermelon at the top of the restaurant?

  16. Conditions/assumptions for free fall projectile • is the force that causes the acceleration (the change in velocity) • Assume air resistance during free fall, so acceleration due to gravity is a 10 m/s2 • Assume object start from (initial velocity will be)

  17. Questions • When an object is in free fall: • Q: Does its velocity change by regular amounts each second that it’s falling? If yes, why; if no, why not? • A: • Q: Is the distance it falls per second the same amount each second? Explain why. • A:

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