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**Projectile Motion Notes**

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What is a projectile? A projectile is any object which once projected or dropped continues in motion by its own inertia and is influenced only by the downward force of gravity.

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An object dropped from rest is a projectile (provided that the influence of air resistance is negligible). An object which is thrown vertically upward is also a projectile (provided that the influence of air resistance is negligible). An object is which thrown upward at an angle to the horizontal is also a projectile (provided that the influence of air resistance is negligible).

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Projectile Motion

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Projectile Motion

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**Characteristics of a Projectile's Trajectory**

Many projectiles not only undergo a vertical motion, but also undergo a horizontal motion. That is, as they move upward or downward they are also moving horizontally. There are the two components of the projectile's motion – horizontal and vertical motion.

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**Horizontally Launched Projectiles**

Consider a cannonball projected horizontally by a cannon from the top of a very high cliff. The projectile travels with a constant horizontal velocity and a downward vertical acceleration.

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**Non-Horizontally Launched Projectiles**

Consider the cannon is aimed upward and shot at an angle to the horizontal from the same cliff. The projectile would travel with a parabolic trajectory.

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Practice Suppose a rescue airplane drops a relief package while it is moving with a constant horizontal speed at an elevated height. Assuming that air resistance is negligible, where will the relief package land relative to the plane?

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Notes and Explanations

Notes and Explanations

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