![]() ![]() Since vertical and horizontal motions are independent, we can analyze them separately, along perpendicular axes. Keep in mind that if the cannon launched the ball with any vertical component to the velocity, the vertical displacements would not line up perfectly. You can see that the cannonball in free fall falls at the same rate as the cannonball in projectile motion. Figure 5.28 compares a cannonball in free fall (in blue) to a cannonball launched horizontally in projectile motion (in red). The most important concept in projectile motion is that horizontal and vertical motions are independent, meaning that they don’t influence one another. Air resistance does significantly alter trajectory motion, but due to the difficulty in calculation, it is ignored in introductory physics. As an object travels through the air, it encounters a frictional force that slows its motion called air resistance. The object is called a projectile, and its path is called its trajectory. After the initial force that launches the object, it only experiences the force of gravity. In contrast, motion in the horizontal axis does not require these equations because horizontal acceleration is zero.Projectile motion is the motion of an object thrown (projected) into the air. Motion in the vertical axis can be modelled using rectilinear equations. ![]()
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