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resultant
 a vector representing the sum of two or more vectors
 drawn from the tail of the first to the head of the last, sum of the vectors

Pythagorean theorem
a^{2}+b^{2}=c^{2}




projectile motion
 free fall with an initial horizontal velocity
 neglecting air resistance, a projectile has a constant horizontal velocity and a constant downward free fall acceleration, and follows a parabolic path
 two objects fall at the same rate and will hit the ground at the same times when released together, even if one is thrown at an angle with initial horizontal velocity

properties of vectors
 can be moved parallel to themselves through planes
 can be multiplied/divided by scalars
 can be added in any order, can be subtracted by adding opposite directions

zero vector
vectors with 0 magnitude with no assigned direction

454590 triangle
 hyp=x
 sides=x

306090 triangle
 smallest side=x
 middle side=x
 hyp=2x

trajectory
parabolic path that an object in projectile motion follows

acceleration neglecting air resistance
no horizontal acceleration

