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NotTim Group Title

Simple practical application (no math): A child is standing on a slowly rotating ride in a park. the ride operator makes the statement that in Earth's frame of reference, the child remains at the same distance from the centre of the ride because there is no net force acting on him. Do you agree with this statement? Explain your answer.

  • one year ago
  • one year ago

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  1. NotTim Group Title
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    MY ANSWER: Yes, I agree with this statement because the child maintains a constant radius throughout the ride. @ every point on the ride, there is the same gravitational force and centripetal force throughout

    • one year ago
  2. NotTim Group Title
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    I'm sorry but that is NOT a viable option.

    • one year ago
  3. NotTim Group Title
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    uhh

    • one year ago
  4. YesterdayiSaidTomorow Group Title
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    da fuk is Earth's frame of reference?

    • one year ago
  5. NotTim Group Title
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    txtbook.

    • one year ago
  6. NotTim Group Title
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    http://bit.ly/UAsCu4

    • one year ago
  7. YesterdayiSaidTomorow Group Title
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    post it on yahooanswers

    • one year ago
  8. YesterdayiSaidTomorow Group Title
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    this site sux

    • one year ago
  9. NotTim Group Title
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    lol like i trust yahoo answers.

    • one year ago
  10. YesterdayiSaidTomorow Group Title
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    hey mang, it's better than nothing

    • one year ago
  11. NotTim Group Title
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    NOThing

    • one year ago
  12. NotTim Group Title
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    I'm going to sleep. If anyone responds. I'll be back.

    • one year ago
  13. eseidl Group Title
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    I disagree. In the Earth's frame the child is moving in a circle. Since his velocity vector is constantly changing, his acceleration is NOT zero, thus there must be a net force acting on him.

    • one year ago
  14. eseidl Group Title
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    The net force acting on him is the centripetal force. It is the force that causes him to move in a circle. If there were no net force acting on him, he would continue to move in a straight line at content speed.

    • one year ago
  15. eseidl Group Title
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    constant*

    • one year ago
  16. NotTim Group Title
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    But relative to the earth's frame of reference?

    • one year ago
  17. eseidl Group Title
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    My answer is relative to the Earth's frame.

    • one year ago
  18. NotTim Group Title
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    so, really, the only reason why the child remains the same distance from the centre of the ride is because of the constant radiu, and not the force?

    • one year ago
  19. eseidl Group Title
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    Your answer states that you agree because there is the same net gravitational and centripetal force throughout the motion. It is true that the net forces are constant throughout the motion. The ride operator argues that there is NO net force on the kid. Obviously this is not correct, the kid isn't moving in a straight line at constant speed (Newton's first law).

    • one year ago
  20. NotTim Group Title
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    so, the correct answer is that although the child remains the same distance from the centre, their still is a net force acting upon him?

    • one year ago
  21. eseidl Group Title
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    the centripetal force is what keeps the kid at a constant distance from the center of the circle. If the centripetal force changed, the radius would change. In the extreme case, where the centripital force vanishes, the kid would fly off in straight line, away from the centre of the circle. |dw:1349029423494:dw|

    • one year ago
  22. eseidl Group Title
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    That's absolutely correct

    • one year ago
  23. NotTim Group Title
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    thx then

    • one year ago
  24. eseidl Group Title
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    Technically the centripetal force isn't constant. It has a constant magnitude, but the direction of the force is always changing (it is always pointing to the center of the circle as the kid moves around). The direction of the force is changing so it isn't a "constant" force.

    • one year ago
  25. eseidl Group Title
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    no problem. I hope this makes sense. Basically, the only time there is no NET force on an object is when the object moves in a straight line at constant speed. If either the speed or the direction of motion are not constant, there MUST be a NET force.

    • one year ago
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