![]() Because of the object's inertia, no external force is needed to maintain the horizontal velocity component of the object's motion. The only force of mathematical significance that is actively exerted on the object is gravity, which acts downward, thus imparting to the object a downward acceleration towards the Earth’s center of mass. The study of such motions is called ballistics, and such a trajectory is a ballistic trajectory. The curved path of objects in projectile motion was shown by Galileo to be a parabola, but may also be a straight line in the special case when it is thrown directly upward or downward. In the particular case of projectile motion on Earth, most calculations assume the effects of air resistance are passive and negligible. Projectile motion is a form of motion experienced by an object or particle (a projectile) that is projected in a gravitational field, such as from Earth's surface, and moves along a curved path under the action of gravity only. Parabolic water motion trajectory Components of initial velocity of parabolic throwing Ballistic trajectories are parabolic if gravity is homogeneous and elliptic if it is round. ( Learn how and when to remove this template message)
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