2. Acceleration
Acceleration (a): The rate of change of an object’s velocity.
Vector
English Translation: Something is speeding up or slowing down

3. Average acceleration is: the ratio of change in velocity to the
time taken to change the velocity v a = t
a = average acceleration
SI Units: m/s2

4. The “sign” of the acceleration does not indicate whether the speed is
increasing or decreasing.
Positive sign: velocity becomes more positive
Negative sign: velocity becomes more negative
If velocity and acceleration are in the SAME direction, the object speeds up.
If velocity and acceleration are in OPPOSITE directions, the object slows down.

6. Kinematic Equations vf = vi + at Δx= vit + ½at2 vf2 = vi2 + 2aΔx
t = time elapsed
vf = vi + at
Δx = displacement
vi = initial velocity
Δx= vit + ½at2
vf2 = vi2 + 2aΔx
a = acceleration
vf = final velocity

7. Example 1

8. Example 2

9. Example 3