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\noindent {\Large F\^{o}r\c{c}as dependentes da posi\c{c}\~{a}o}

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1) $\,U(x)\,=\,-U_{o}\,\frac {x^2+1}{x^4+8}$

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2) $\,U(x)\,=\,U_{o}\,(\frac {1}{x^2}-\frac {2}{x^4})$

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3) $\,U(x)\,=\,U_{o}\,(\frac {1}{x^2}-\frac {3}{x}+2)$

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4) $\,U(x)\,=\,U_{o}\,\frac {1}{x^2+1}$

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5) $\,U(x)\,=\,U_{o}\,(\frac {4}{x^2+1}+x^2)$

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6) $\,U(x)\,=\,U_{o}\,\frac {4}{x^2-4}$

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7) $\,U(x)\,=\,U_{o}\,\frac {4*X}{x^2+1}$

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8) $\,U(x)\,=\,U_{o}\,(2x^3-x^2)$

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9) $\,U(x)\,=\,U_{o}\,(1\,-\,\frac {5}{x^2+1})$

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11) $\,U(x)\,=\,-Wd^2\,\frac {x^2+d^2}{x^4+8d^4}$

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11) $\,U(x)\,=\,-Wd^2\,\frac {x^2+d^2}{x^4+8d^4}$

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11) $\,U(x)\,=\,-Wd^2\,\frac {x^2+d^2}{x^4+8d^4}$

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12) $\,U(x)\,=\,-Wd^2\,\frac {x^2+d^2}{x^4+8d^4}$

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13) $\,U(x)\,=\,-Wd^2\,\frac {x^2+d^2}{x^4+8d^4}$

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