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Two questions on acceleration and an experiment

  1. Jul 18, 2012 #1
    Hi.

    First post here and not a native english speaker, so be kind :-)

    1) I have never really understood what it means when we say that the gravitation accelerations is 9,82 m/s2

    What is the practical use. Could anyone tell me with a simple example. I think the confusing part is the s2.

    2) I have seen an experiment relating to one of newtons laws which consitet of a wagon moving down a hill. At some point a spring on the wagon was released which made the ball flying and landing in the wagon (which had already moved). Does this experiment have a name?

    Thanks in advance. I hope you can help :-)
     
  2. jcsd
  3. Jul 18, 2012 #2
    It means that, for every second you are in free-fall, your velocity towards the earth increases by 9.8 meters per second. If I jump from a plane with a velocity of 0 meters per second, and it takes me 200 seconds to reach the ground, my velocity will be about 2000 meters per second when I reach the ground.

    It doesn't have a name as far as I know of. It's demonstrating that the velocity in the X direction is independent of that in the Y direction.
     
  4. Jul 19, 2012 #3
    Thank you! Helped a lot.
     
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