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    summerschool's Avatar
    summerschool Posts: 2, Reputation: 1
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    #1

    Jul 10, 2008, 03:56 PM
    Force of Gravity
    Without air resistance, all objects in free-fall on earth accelerate downwards at 9.81m/s2.
    Yet, all objects have different Fs values...
    how does it make sense for different ojects to have different foces of gravity and yet to all have the same acceleration of 9.81m/s2?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jul 11, 2008, 07:22 AM
    Recall Newton's Law: . Or rewriiten as: . This says that an object's acceleration is equal to the force applied to it divided by its mass. Under gravity an object of mass feels a force downward equal to . So, if you substitute ino a = you get . Hence all objects under earth's gravity at the earth's surface accelerate at the rate .

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