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