Chapter 1 Sec.1
SPEED – how fast something moves
RATE – change over time
SPEED = Rate of change in position
or
“rate of motion”
Instantaneous speed- rate of motion at
any given instant (speedometer)
**Speed at that moment**
Constant speed –
Speed that doesn’t vary
Average Speed –
Total distance traveled / Total time

Distance, Speed and Time is shown in the
equation d = v * t
 d = distance
 v = speed
 t = time
If you know the distance and time
v = d/t
Florence Griffith Joyner set a world record by
running 200 m in 21.34 s.
What was her average speed?
FORMULA:
 v=
speed
 d= distance
 t = time
v = d/t
ANSWER:
v = d/t
 200
m / 21.34 s = 9.37m/s
t= d/v
The world’s fastest passenger elevator
operates at an average speed of about
10 m/s. If the 60th floor is 219 m above the
first floor, how long does it take the elevator
to go from the first floor to the 60th floor?
SOLUTION:



d = 219m
v = 10m/s
t=?
t= d/v
ANSWER:
t= d/v
t
= 219m per
sec./10s
t
= 21.9s
t= d/v
Calculate Speed:
v = d/t
Velocity and Speed:

Speed –
◦ how fast something is moving

Velocity –
◦ tells SPEED and DIRECTION
speed can stay constant when velocity changes
Speed can stay constant when velocity changes
Graphing Speed
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
Swimmer 1
Swimmer 2
0
10
20
30