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<p><big>Forces</big></p>
<p>When in flight, the main or major <a href="page.php?w=force">force</a>s acting on the <a href="page.php?w=projectile">projectile</a> are <a href="page.php?w=gravity">gravity</a>, <a href="page.php?w=drag_%28physics%29">drag</a>, and if present, <a href="page.php?w=wind">wind</a>; if in powered flight, thrust; and if guided, the forces imparted by the control surfaces.</p>

<p>In small arms external ballistics applications, gravity imparts a downward acceleration on the projectile,</p><p>
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