![]() ![]() ![]() Before we formally define projectile motion, we will look at its properties. Anyone who has tossed any kind of object into the air has observed this parabolic trajectory called projectile motion. You can see the symmetry of the ball’s path because the shape of the upward-bound curve exactly matches the shape of the downward-bound curve. After the ball leaves the racquet, its path curves upward to this highest point and then curves downward. Another imaginary line shows the uppermost point of the trajectory (at the top of the highest ball). If you draw an imaginary line through the ball images, you can trace the parabola from where the ball made contact with the racquet to the other end. The ball in Figure 1 was hit with a tennis racquet. Through the air along a parabolic trajectoryįigure 1 The path of a projectile follows the curve of a parabola. The x-direction is horizontal and positive to the right, and the y-direction is vertical and positive upward. The ball acts like a projectile, which is an object that is moving through the air and accelerating due to gravity. If you ignore the effects of air resistance and Earth’s rotation, the curved path, or trajec- tory, of the ball under the influence of Earth’s gravity follows the curve of a parabola, as Figure 1 shows. The ball rises to a certain point, and gravity eventually curves the path of the ball downward. 1 Projectile Motion In sports in which a player kicks, throws, or hits a ball across a field or court, the player’s initial contact with the ball propels the ball upward at an angle. ![]()
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