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25 October, 13:19

4. Two students are sitting in the cafeteria eating lunch. They move so that the distance between them is now one-quarter as great as it was before. The force of attraction between them (gravitational that is) is now times as great.

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  1. 25 October, 15:30
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    The force of attraction between them will be 16times as great.

    Explanation:

    According to the law of gravitation, the force experienced by both students is expressed as shown;

    Fo = GMm/d² ... (1)

    M and m are the masses of the students

    d is the initial distance between them

    G is the gravitational constant.

    If they move so that the distance between them is now one-quarter as great as it was before, the new distance between them will be 1/4 of initial distance 'd' i. e d/4

    The new force that will exist between them will be;

    F = GMm / (d/4) ²

    F = GMm / (d²/16)

    F = 16GMm/d² ... (2)

    Dividing equation 2 by 1, we have;

    F/Fo = {16GMm/d²}/GMm/d²

    F/Fo = 16GMm/d² * d²/GMm

    F/Fo = 16

    F = 16Fo

    This shows that if the distance between them is one quarter as great ad before, the force of attraction between them will be 16times as great.
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