![]() This is where we run into some linguistic complications. The only relevant quantities that might vary from projectile to projectile then are initial velocity and initial position The trajectory of a projectile is thus entirely determined the moment it satisfies the definition of a projectile. An object ceases to be a projectile once any real effect is made to change its trajectory. Of course, the pilot of a disabled airplane may regain control before crashing and avert disaster, but then the airplane wouldn't be a projectile anymore. No amount of leaning to one side will make a foul ball turn fair. Batters may apply "body English" after hitting a long ball, but they do so strictly for psychological reasons. A projectile is any object with an initial non-zero, horizontal velocity whose acceleration is due to gravity alone.Īn essential characteristic of a projectile is that its future has already been preordained. The normal amounts of drag and buoyancy just aren't large enough to save the passengers on a doomed flight from an unfortunate end. Even though the drag and buoyant forces acting on it are much greater in absolute terms than they are on the balloon, gravity is what really drives a crashing airplane. In contrast, a crashing airplane would be considered a projectile. Helium-filled balloons can't be thrown long distances and don't normally fall. A tossed helium-filled balloon is not normally considered a projectile as the drag and buoyant forces on it are as significant as the weight. This is not to say that other forces do not exist, just that their effect is minimal in comparison. The force of primary importance acting on a projectile is gravity. the space shuttle or any other spacecraft after main engine cut off (MECO).a runner in mid stride (since they momentarily lose contact with the ground).a moving airplane in the air with its engines and wings disabled.a bullet the instant it exits the barrel of a gun or rifle.a baseball that has been pitched, batted, or thrown.(This is an informal definition.) The path of a projectile is called its trajectory. A projectile is any object that is cast, fired, flung, heaved, hurled, pitched, tossed, or thrown.
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