Physics Projectile Motion
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CHAPTER 3 1) The drawing shows projectile motion at three points along the trajectory. The speeds at the pointers are v1, v2, and v3. Assume there is no air resistance and rank the speeds, largest to smallest. ANSWER: v1 > v3 > v2 The horizontal component v x , of the projectile’s velocity remains constant throughout the motion, since the acceleration a x , in the horizontal direction is zero (a x = 0 m/s 2 ). The vertical component v y , however, changes as the projectile moves. This component is greatest at point 1, decreases to zero at point 2 at the top of the trajectory, and then increases to a magnitude less than that at point 1 as the projectile approaches point 3. 2)
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Transcript of Physics Projectile Motion
CHAPTER 3
1) The drawing shows projectile motion at three points along the trajectory. The speeds at the pointers are v1, v2, and v3. Assume there is no air resistance and rank the speeds, largest to smallest.
ANSWER: v1 > v3 > v2
The horizontal component vx, of the projectile’s velocity remains constant throughout the motion, since the acceleration ax, in the horizontal direction is zero (ax = 0 m/s2). The vertical
component vy, however, changes as the projectile moves. This component is greatest at point 1, decreases to zero at point 2 at the top of the trajectory, and then increases to a magnitude less than that at point 1 as the projectile approaches point 3.
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