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Projectile MotionEssential Questions: What impacts have analyzing projectiles had on society? What affects the path of a projectile?
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Projectile MotionA projectile is an object with horizontal motion upon which the only force acting is gravity.
Give examples of projectiles.
How has the study of projectiles been important?
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All projectiles take a parabolic path.
Why do you think it is called this?
The shape of its path looks like a parabola.
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Projectile motion is made up of two parts (or components):A horizontal (x) component and a vertical (y) component.
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The path a projectile takes is called its trajectory.
The horizontal distance a projectile travels is called its range.
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Horizontally Launched Projectiles
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The x and y components act independently of each other.
A bullet is fired horizontally and another is dropped at the same time from
the same height. Which bullet hits the ground first? Neither. They hit at the same time.
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• The initial speed in the x direction is the initial speed of the object.
• The initial speed in the y direction is zero.
• The horizontal speed of a projectile is constant.
• The vertical motion of a projectile follows the same rules as free fall.
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Horizontal (x) Vertical (y)d = d = v = a = t = t = d = vt d = ½ a t2
Where did vi t go?
d = vi t + ½ a t2
vi is zero, it cancels out
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A football is thrown horizontally with a speed of 20 m/s. It hits the ground 0.3 seconds later. What is the range of the ball? 6.0mFrom what height was the ball thrown?0.44m
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A projectile is launched horizontally from a height of 3.0 m. The range of the projectile is 6.0 m. How long did it taketo land?0.78 sWhat was the initial speed of the projectile?7.7 m/s