week2-2

# week2-2 - Projectile Motion The path that a moving object...

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Projectile Motion The path that a moving object follows is called its trajectory . An object thrown horizontally is accelerated downward under the influence of gravity. Gravitational acceleration is only vertical, not horizontal. The object’s horizontal velocity is unchanged, if we can neglect air resistance. Projectile motion involves the trajectories and velocities of objects that have been launched, shot, or thrown.

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The diagram shows the positions at 0.10-sec intervals of a ball moving left to right. Is the ball accelerated? a) Yes. b) No. c) Unable to determine. The ball moves an equal distance during each 0.10-sec interval, so the speed does not change. Thus, the ball is not accelerated.
The diagram shows the positions at 0.05-sec intervals of two balls moving left to right. Are either or both of these balls accelerated? a) Ball A is accelerated. b) Ball B is accelerated. c) Both balls are accelerated. d) Neither ball is accelerated. Both balls are accelerated. Ball A covers an increasing distance in each 0.05-sec interval, so it is speeding up. Ball B is covering less and less distance with each interval, so it is slowing down. Both of these are accelerations.

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Does this represent a realistic trajectory? a) Yes. b) No. c) Maybe. The coyote would not go straight horizontally, pause, and then fall straight down. There are many examples in movies and on television of unrealistic trajectories. Can you think of any others?
What does the trajectory look like? The acceleration of the horizontal motion is zero (in the absence of air resistance). The object moves with constant horizontal velocity. It travels equal horizontal

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week2-2 - Projectile Motion The path that a moving object...

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