Physics

Left & down

Left & down

negative

Right & up

positive

Scalar

Scalars are quantities that take into account amount, not direction

vector

Vectors are quantities that take into account direction

Unit used to describe time

seconds

displacement formula

final position - initial position (xf-xi)

speed

scalar does not take into account direction distance/t

velocity

vector displacement/t

slope

speed

Negatives in physics

opposite way (go by absolute value)

Distance

does not take into account direction—> scalar

unit for distance and displacement

meters

Displacement

Displacement takes into account the "net" distance traveled, therefore it is a vector quantity.

curved lines are

not lines not constant slope changing slope changing velocity

Constant slope

constant velocity

0 slope below x axis

negative velocity

getting steeper over time (negative way

negative steep velocity

Acceleration

describes an object's change in velocity over a given period of time meters per second per second m/s/s m/s^2 vector

Kinematics

way of describing the motion of objects without describing the causes.

You can describe an object's motion

In words Mathematically Pictorially Graphically

Symbol: t

Variable: Time Unit: s

Symbol: a

Variable: acceleration Unit: m/s^2

Symbol: x or y

Variable: Displacement Unit: m

Symbol: v

variable: final velocity Unit: m/s

Symbol: Vo

Variable: Initial Velocity Unit: m/s

Symbol: g

Variable: acceleration due to gravity Unit: m/s^2

GUESS method

Givens [initial velocity counts as well], Unknown[what we're looking for], Equation, Substitute, Solve.

If velocity and acceleration have the same sign,

the object is speeding up

Kinematic equations

All are used when the acceleration is CONSTANT.

Starting from rest

initial velocity is zero

Coming to a stop

final velocity is zero

V=Vo+at

no displacement final velocity

x=vot+1/2a(t^2)

displacement no final velocity can be used to find distance