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<p>the field source (larger), and  is a <a href="page.php?w=unit_vector">unit vector</a> directed from the field source to the sample (smaller) mass. The negative sign indicates that the force is attractive (points backward, toward the source).</p>

<p>Then the attraction force  vector onto a sample mass  can be expressed as:</p>

<p>
:</p>

<p>Here  is the <a href="page.php?w=friction">friction</a>less, free-fall acceleration sustained by the sampling mass  under the attraction of the gravitational source.It is a vector oriented toward the field</p><p>
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