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Unformatted text preview: PROJECTILE MOTION 1. A projectile launched into space constitutes motion in two dimensions. 2. A projectile moves in the x and ydirections simultaneously. 3. A projectile may be launched horizontally or at an angle θ with the horizontal. v x v x v x v x v x v x v y v y v y v y v y Horizontal projectile Projectile at an angle 1 HORIZONTAL PROJECTION The horizontal velocity v x remains a constant. A horizontal projectile has a horizontal motion and a vertical motion The horizontal and vertical motions are independent of each other v x v x v x o t i o n v y = 0 v x v x v x v y v y v y v y v y v e r t i c a l m o horizontal motion 2 v x v x v x v x v x v x v y v y v y v e r t i c a l m o t i o n orizontal v y = 0 The vertical velocity v y increases downward like that of a freefalling object. The initial vertical velocity v yo = 0 v y v y horizontal motion v y = v yo – gt The acceleration in the vertical direction is –g ms2 . v yo = 0 v y = gt v = v x i – gt j 3 1 2 Two balls are held at the same height from the ground. If ball 1 is dropped and ball 2 is projected horizontally with a velocity v x , which will fall on the ground first? Does the illustration answer this question? he vertical motion of the v x The vertical motion of the dropped ball and the vertical motion of the horizontally projected ball are identical. The vertical velocity in both cases is v y = gt They fall at the same time. 4 Watch the horizontal and vertical motions of the horizontally projected ball....
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 Fall '10
 George
 Physics, Projectile Motion, Horizontal plane, Vertical direction, Vx Vx Vx

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