◦ an object moves a
certain distance in
a certain amount
◦ an object’s
Distance is how far something has moved
Measured in METERS, km, cm, mm, etc.
Displacement is the
change in position of
Also measured in
METERS, km, cm,
Speed is the
over the amount
of time it takes to
Measured in m/s (meters per second)
Speed (m/s) = distance (m) ÷ time (s)
Calculating SpeedCalculating Speed
1. After driving for exactly 60 seconds, you
have driven 600 meters. What speed
were you driving?
2. After driving for 1 hour, you have driven
72 kilometers. What speed were you
a. Calculate the speed in km/hr
b. Calculate the speed in m/s
Constant & Changing SpeedConstant & Changing Speed
Constant speed means an object does not
speed up or slow down.
Changing speed means an object gets
faster or slower.
Average SpeedAverage Speed
We usually calculate the average speed:
Average speed (m/s) = total distance (m) ÷ total
Yesterday, John Doe ran 6 km in 30 minutes.
Sometimes he sped up and sometimes he
slowed down. What was his average speed?
a. Convert 6km to m: 6km x 1000m/1km = 6000 m
b. Convert 30 mins to sec: 30 min x 60sec/1min =
c. Calculate avg. speed: 6000 m ÷ 1800 sec =
Instantaneous SpeedInstantaneous Speed
Speed can be
measured at a
certain point in
For instance, if
you are driving,
may read 30
You don’t have to drive
for an hour for your car
to know this – your
speed is instantaneous.
Graphing SpeedGraphing Speed
Distance and Time
◦ Dependent Variable:
Velocity is a measure of an object’s
SPEED and DIRECTION.
Velocity is measured by:
velocity = displacement ÷ time
v = d/t
Velocity & DisplacementVelocity & Displacement
If you run around a
circular track and
end up in the same
position you started,
your displacement is
So is your velocity: v
= 0/time, so v=0
Calculating VelocityCalculating Velocity
1. You walk down a winding road and end
up 80 meters from your starting point.
It took 1 minute and 20 seconds to walk
from one end to the other. What was
2. Was your speed greater or less than the
velocity you calculated in #1?