Physics- unit 3: Kinematic Equations
acceleration unit
m/s^2
acceleration can be both
positive and negative
variables in the short cut equation
vf= final velocity vi= initial velocity d=distance a=acceleration
variables in final velocity equation
vf= velocity final vi= velocity inital a= acceleration t=time
acceleration equation
vf= vi + at
final velocity equation
vf= vi + at
Shortcut equation
vf^2= vi^2 +2ad
when velocity and acceleration are different directions, they're
working against each other
when velocity and acceleration are the same directions, they're
working together
use the shortcut equation when
you are not given time
Guess method
Givens Unknown Equation Substitution (with units) Solve
speeding up=
acceleration
average acceleration equation
change in velocity over change in time a= v2-v1/t2-t1
variables in displacement equation
d= displacement vi= initial velocity t=time a=acceleration
displacement equation
d= vit + 1/2at^2
slowing down=
deceleration
negative velocity and positive acceleration causes
slowing down, turn around, speed up in the positive direction
Positive velocity and negative acceleration causes
slowing down, turning around and eventually speeding up in the negative direction
Positive velocity and positive acceleration causes
speeding up in a positive direction
negative velocity and negative acceleration causes
speeding up in the negative direction (negative acceleration vs deceleration- this is negative acceleration)
an objects final velocity can be found by considering
starting velocity acceleration amount of time over which it accelerates.
acceleration
the rate at which speed is changing
acceleration is a __ quantity
vector