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    #1

    forces

    When gravitational forces exceed forces of resistance, slope failure occurs.
    [why forces is plural ? In which circumstances it should be plural?]

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    #2

    Re: forces

    When gravitational forces exceed forces of resistance, slope failure occurs.
    [why forces is plural ? When you are speaking in a general way about all gravitational forces.

    When speaking about a specific force:
    The gravitational force of the block caused it to . . .

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