1. Notes: 1-Dimensional Horizontal Motion
Speed – the measure of how much time it takes an object to change position from one point to another point
-rate of change in position
-rate of motion
Speedaverage = Ddistance delta means “change
Dtime
S = Dd units m cm km
Dt s , min , hr

2. -rate of change in position with direction
Velocity– the measure of how much time it takes an object to change position from one point to another point, including its direction
-rate of change in position with direction
-rate of motion with direction
velocity = D displacement (Direction)
D time
Vaverage = Dd E,W,N,S Dt
units m East cm North km South
s , min , hr

3. Average speed – the total distance traveled divided by the total time of travel
Instantaneous speed – speed at a given point in time
Constant speed – speed with no change. Object does not slow down or speed up.

4. Acceleration
rate of change in velocity, or direction
how fast velocity is changing
Acceleration = change in velocity over a
change in time
aaverage = Dv = Vf – Vi units:
D t D t
Vf = final velocity
Vi = initial velocity

5. Vf = 60 km/hr
Vi = 20 km/hr
t = 1 hr
What is the acceleration of the car?
a = Dv = Vf – Vi
D t D t =

6. Vf = 20 km/hr
Vi = 60 km/hr
t = 1 hr
What is the acceleration of the car?
a = Dv = Vf – Vi
D t D t =