
fundamental unit
basic units from which all other units are made

derived unit
units that are a combination of two or more of the fundamental units

converesions
1 hr = 3,600 s
1km = 1,000 m

to change an object's motion you need __ __.
the change an object's motion you need unbalanced forces.

constant or no motion means __ __.
constant or no movement means balanced forces.

three ways to describe motion

reference point
"zero" location in a frame of reference

frame of reference
a number line used to describe motion

position
separation between the object and reference point

scalar quantity
 quantity that only has size/magnitude
 # and unit
 distance is scalar

vector quantity
 quantity that has size, magnitude and direction
 #, unit and direction
 acceleration, position, displacement, velocity

instantaneous position
position at a certain time

distance (d)
 measures the separation between two objects
 needs no reference point
 scalar quantity

displacement (Δd)
 change in position of an object (start point to end point)
 vector quantity

average velocity (v wit line)
the displacement of an object divided by the time interval over which it moved.

If the average velocity is the same throughout the time interval then we have __ __.
If the average velocity is the same throughout the time interval then we have constant velocity.

Speed vs. Velocity
speed: distance divided by time; scalar quantity
velocity: displacement divided by time; vecotr quantity

acceleration
the rate of change of velocity; change of velocity divided by time.

velocitytime graphs
 the slope of a velocitytime graph represents acceleration.
 the area under a velocitytime graph represents displacement (vector quantity).

distancetime graphs
the slope of a positiontime graph represents velocity (speed).

linear motion
motion that occurs in straight line

equation for constant acceleration

equation for when acceleration is constant and we do not have final velocity

equation used when acceleration is constant and you do not have time

summary of three equations
no displacement :
no final velocity :
 no time :

