physics chapter 3 section 3 - ddamm. · pdf filephysics chapter 3! section 3.3! projectile...
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Projectile Motion
Physics Chapter 3 Section 3.3
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Projectile Motion --A projectile is an object thrown into the air!
with some initial horizontal velocity, and then!falls under the influence of gravity. !
--The path followed by a projectile is a parabola.!
--Examples of projectiles include:
baseballs! golf balls!long jumpers! arrows!
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--If air resistance is small enough to be ignored,!the horizontal component of the projectiles!velocity will remain constant. !
--The vertical component will accelerate at the!rate of g = -9.81 m/s2.
--The resultant velocity of the projectile at any!given time can be found by adding the!horizontal (x) and vertical (y) components.
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Projectile Motion and Free Fall --A projectile is an object in free fall with an!
initial horizontal velocity.!
--A projectile will hit the ground at the same!time as an object that is dropped straight!down from the same height and at the same!time.!
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Mathematical Solutions to Projectile Motion Problems
The horizontal component may be found from:!
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Δx = vxΔtvx = vx,i
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The vertical component may be found from:!
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Δy = −12g(Δt)2
vy, f = −gΔt
vy, f2 = −2gΔy
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Example: What is the vertical and horizontal distance traveled by a projectile whose initial horizontal velocity is 5.0 m/s after 5.0 s?