Motion in One Dimension
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1D motion
motion forward or backward, up or down, left or right

frame of reference
a coordinate system for specifying the precise location of objects in space

displacement
the change in position of an object

positive/negative direction
 positive: up/right
 negative: down/left

average velocity
total displacement divided by the time interval during which the displacement occurred

instantaneous velocity
the velocity of an object at some instant (or specific point in its path)

velocity vs. speed
velocity gives a direction, is a vector whereas speed is a scalar

position vs. time graph slope
 slope is the velocity
 steeper slope means greater speed
 straight line is constant velocity
 horizontal line is at rest
 positive value means positive direction, negative value means negative direction

acceleration
the rate of change of velocity

acceleration with constant velocity
0

velocity vs. time graph
 shows acceleration
 object is at rest when the velocity is 0
 upward slope: speed increasing
 horizontal slope: constant velocity, no acceleration
 downward slope: speed decreasing

positive velocity and acceleration
speeding up

negative velocity and acceleration
speeding up

positive velocity and negative acceleration
slowing down

negative velocity and positive acceleration
slowing down

0 velocity and 0 acceleration
at rest

constant acceleration
velocity increases by the same amount during each interval; displacement for each time interval increases by the same amount

free fall
motion of an object falling with a constant acceleration

motion
natural event that involves a change in the position or location of something

3 physical descriptions that describe motion
 displacement: change in position
 velocity: rate at which the displacement changes
 acceleration: rate at which the velocity changes

vector
 physical quantity with magnitude and direction
 e.g. velocity, displacement, acceleration, force

sector
 has magnitude only
 e.g. speed, mass, temperature, time

acceleration vs. time graph
 horizontal line is constant acceleration
 sign of acceleration is the same as the sign of velocity

free fall constant
9.81m/s^{2}