1. Acceleration = Change in velocity / change in time
What is Acceleration??
Acceleration is a Vector!!
Rate of change in velocity in a given time interval
Describes how rapidly the velocity of an object is changing
Acceleration = Change in velocity / change in time
a (average) = Dv / Dt
Units: length / time2 – e.g., m/s2, km/h/s

2. Average acceleration

3. Average Acceleration Other Equations: Rearranging, Dv = a ave Dt , OR,
v(final) = v(initial) + a (avg) Dt

4. Think About It!
If the acceleration of an object is zero, does that mean that the velocity is zero? Explain.
If the velocity of an object is zero, does that mean that the acceleration must be zero?? Explain.

5. Just like Velocity Acceleration is a vector quantity
Has both a magnitude (speed) AND direction
Can be positive or negative
JUST DIRECTIONAL!!!

6. Acceleration is the slope of a velocity vs. time curve.
Since slope = rise/run,
Just as ,

7. vf = vi + a Δ t Δd = vav Δ t vav = (vf + vi)/2 Constant
Δ t = time
d = displacement
Δd = vav Δ t
vi = initial velocity
vav = (vf + vi)/2
vav = average
velocity
Δd = vit + 0.5at2
a = acceleration
vf = final velocity

8. Kinematic Equations for Uniform Acceleration
Variables missing
acceleration
displacement
final velocity
time
Note: do left out for convenience

9. Practice problems
With an average acceleration of -1.2 m/s2, how long will it take a cyclist to bring a bicycle with an initial speed of 6.5 m/s to a complete stop?
A: 5.4 s
Suppose a treadmill has an average acceleration of 4.7 × 10.3 m/s2.
a. How much does its speed change after 5.0 min?
b. If the treadmill’s initial speed is 1.7 m/s, what will its final speed be?
1.4 m/s and 3.1 m/s