|
Projectile motion is a form of motion in which an object or particle (called a projectile) is thrown near the earth's surface, and ''it moves along a curved path under the action of gravity only.'' The only force of significance that acts on the object is gravity, which acts downward to cause a downward acceleration. There are no horizontal forces needed to maintain the horizontal motion – consistent with the concept of inertia. == The initial velocity == If the projectile is launched with an initial velocity , then it can be written as :. The components and can be found if the angle, is known: :, :. If the projectile's range, launch angle, and drop height are known, launch velocity can be found using Newton's formula :. The launch angle is usually expressed by the symbol theta, but often the symbol alpha is used. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「projectile motion」の詳細全文を読む スポンサード リンク
|