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

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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

Projectile Motion II 10/2/13

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

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

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

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

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

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”

Notes End Here

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.

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

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

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

A falling object

A falling object

Projectile (Horizonal)

Projectile (Launched)

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

Formula Cards Component axis Horizontal vs. Launched
Projectile y-component Projectile x-component

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