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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) d x = horizontal displacement d y = vertical displacement Velocity (m/s) v x = horizontal velocity v y = vertical velocity

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Projectile Quantities Acceleration a x = 0 m/s 2 (no horizontal acceleration) a y = m/s 2 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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Quantity Horizontal Component Vertical Component Displacement Yes, same distance each second Yes, different distances each second. Velocity Yes, Constant Yes, changing by m/s each second. AccelerationNo 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 projectiles 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 TimeHorizontal Displacement Vertical Displacement 0 s0 m, right0 m 1 s20 m, right5 m, down 2 s40 m, right20 m, down 3 s60 m, right45 m, down 4 s80 m, right80 m, down 5 s100 m, right125 m, down

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Velocity TimeHorizontal Velocity Vertical Velocity 0 s20 m/s, right0 m/s 1 s20 m/s, right10 m/s, down 2 s20 m/s, right20 m/s, down 3 s20 m/s, right30 m/s, down 4 s20 m/s, right40 m/s, down 5 s20 m/s, right50 m/s, down

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Acceleration TimeHorizontal Acceleration Vertical Acceleration 0 s0 m/s/s10 m/s/s, down 1 s0 m/s/s10 m/s/s, down 2 s0 m/s/s10 m/s/s, down 3 s0 m/s/s10 m/s/s, down 4 s0 m/s/s10 m/s/s, down 5 s0 m/s/s10 m/s/s, down

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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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