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**Bellwork What are projectiles? *** Turn in “Projectile Lab” *****

They are objects where gravity and air resistance are the only forces acting

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Projectile Motion II 10/2/13

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Components Component: the projection of a vector quantity along a perpendicular axis

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Components Horizontal Right = +x Left = -x Vertical Up = +y Down = -y

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**Projectile Quantities**

Displacement (m) dx = horizontal displacement dy = vertical displacement Velocity (m/s) vx = horizontal velocity vy = vertical velocity

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**Projectile Quantities**

Acceleration ax = 0 m/s2 (no horizontal acceleration) ay = m/s2 or “g” Time (s) t = time - Does not depend on direction (scalar) - It is the same for horizontal and vertical components

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Projectiles and Time (i.e.) A projectile has the same time for how long it goes up and/or down AND left or right

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**different distances each second. Yes, constant 9.81 m/s/s, downward**

Quantity Horizontal Component Vertical Component Displacement Yes, same distance each second different distances each second. Velocity Constant Yes, changing by m/s each second. Acceleration No Yes, constant 9.81 m/s/s, downward “g”

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Notes End Here

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Projectile Example What happens to a projectile’s horizontal and vertical displacement, velocity and acceleration? Example: An object with a initial horizontal velocity of 20 m/s to the right and vertical velocity of 0 m/s.

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**Displacement Time Horizontal Displacement Vertical 0 s 0 m, right 0 m**

5 m, down 2 s 40 m, right 20 m, down 3 s 60 m, right 45 m, down 4 s 80 m, right 80 m, down 5 s 100 m, right 125 m, down

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**Velocity Time Horizontal Velocity Vertical 0 s 20 m/s, right 0 m/s 1 s**

10 m/s, down 2 s 20 m/s, down 3 s 30 m/s, down 4 s 40 m/s, down 5 s 50 m/s, down

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**Acceleration Time Horizontal Acceleration Vertical 0 s 0 m/s/s**

10 m/s/s, down 1 s 2 s 3 s 4 s 5 s

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A falling object

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A falling object

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**Projectile (Horizonal)**

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**Projectile (Launched)**

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**Next Lab You will be able to calculate the horizontal velocity**

From this you will make a calculated prediction where it will land on the floor

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**Formula Cards Component axis Horizontal vs. Launched**

Projectile y-component Projectile x-component

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