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kinematics
velocity
10
Physics
Undergraduate 1
12/19/2006

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Term
adding a vector
Definition
break into components x and y
add all x and ys
then magnitude is = the square root of (xtotal^2 + ytotal^2)
Term
finding theta of a vector
Definition
tan theta = y/x
Term
subtracting a vector
Definition
must multiply the x and y component of vector subtracted by -1 then same as adding
Term
average velocity
Definition
ratio of displacement/ ∆time

average velocity=∆x/∆t
Term
instantaneous veocity
Definition
at a single instant

v=lim ∆x/∆t as ∆t approaches 0
Term
average speed
Definition
average speed=distance/time

s=d/∆t
(scalar)
Term
instantaneous speed
Definition
the magnitude of the instantaneous velocity vector
(scalar)
Term
average acceleration
Definition
is the change in instantaneous velocity over time

ā=∆v/∆t
Term
instantaneous acceleration
Definition
the acceleration at a specific point

a=lim ∆v/∆t as t approaches 0
Term
kinematic equations
Definition
v=v0+at
x=v0t+(at^2)/2
v^2=v0^2+2ax
average velocity=(v0+v)/2
x=(average velocity)t=((v0+v)/2)t
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