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What are the two ways that a vector can be described?
 Magnitude and angle
 Components (X and Y)

Adding vectors
 A+B = C
 Components: A_{x}+B_{x} = C_{x} , A_{y}+B_{y} = C_{y}
 Graphically: graphing from head to tail
 AB = C
 Components: A_{x}B_{x} = C_{x} , A_{y}B_{y} = C_{y} Graphically: graphing from head to head

When adding vectors (componently), a vector with magnitude V making an angle θ with the x axis has what components?
Given the components, what is the vector's magnitude and direction?
 V_{x} = Vcosθ, V_{y} = Vsinθ
 V = √(V^{2}_{x}+V^{2}_{y}), tanθ = V_{y}/V_{x}

Projectile Motion  information without equations
 Break down into two motions (X and Y) which are completely independent of eachother.
 The Y motion has acceleration of g
 The X motion has no acceleration!

Projectile Motion  equations based on components
 y = y_{0}+V_{0y}t1/2gt
 V_{y} = V_{0y}gt
 V_{y}^{2}V_{y0}^{2} = 2gΔy
 x = x_{0}+V_{0x}t
 V_{x} = V_{0x}

How do an object dropped horizontally and thrown vertically compare? Why?
They will both land at the same time, because the ONLY acceleration acting on both is g. It may start with V, but NOT ACCELERATE

What is relative velocity? How is it used practically?>
 Relative velocity is a reference to moving in/on something that is already in motion.
 Ex  walking 4m/s backwards on a train moving 8m/s forward
 Depending on which reference you are using the net velocity will be different!

