1. Acceleration

2. Acceleration:
1. the rate of change of
velocity.
2. can occur through a change
in speed or direction.

3. Two types of acceleration: Positive Acceleration- -velocity and
acceleration are in
the same direction.
Velocity
Acceleration

4. Negative Acceleration -velocity & acceleration are in opposite
directions.
-also called deceleration
Velocity
Acceleration

5. a = vf – vi t Calculating Acceleration:
Velocity final – Velocity initial
time
Acceleration = or
a = vf – vi t

6. Units of Acceleration
___meters____
second x second or
m/s2

7. POSITIVE OR NEGATIVE?
If your answer is a positive
number, this means the object is
accelerating.
(positive acceleration)
-If your answer is a negative
decelerating.
(negative acceleration)

8. Variations of the Acceleration
Formula
Solving for time: t = vf – vi a
Solving for final velocity: vf = at + vi
Solving for initial velocity: vi = vf at

9. 1. A driver floors the gas pedal on her
1. A driver floors the gas pedal on her Ferrari and reaches 35 m/s in about 4.3 seconds. Assuming the car started at rest, how fast did it accelerate?
a =
vf =
vi =
t =

10. A bicyclist hits a moose while
traveling at 19 m/s. It took the
bicyclist .25 seconds to stop. Luckily
the moose was fine, but the bicyclist
had to be transported to local. At what
what rate did the bicyclist decelerate?
a =
vf =
vi =
t =

11. 3. A water balloon dropped from a window
accelerates at a speed of 9.8 m/s2
reaching a final velocity of 15 m/s
before hitting a person. How much
time does it take the balloon to reach
this rate of acceleration?
a =
Vf=
Vi= t=

12. 4. A swimmer speeds up from 1.6 m/s to 2.2
m/s during the last 20 seconds of his
workout. What was his acceleration
during this interval?
a =
vf =
vi =
t =

13. 5. A rocket is launched from the white
sands test site. It has a mass of 800 kg
and can reach a top velocity of 700
m/s. If it takes 3.1 seconds to reach
this velocity, what is its acceleration? a=
vf=
vi= t=