Velocity - describes speed and the direction of an object.
-Velocity can change.It can change even if the speed of the
object remains constant.
Ex:Car going around a curve.Speed is same but velocity changes
(direction changes)
3.
Acceleration-the rate of change of velocity.
-Acceleration can occur through a change in speed or in
direction.
4.
-If the acceleration is in the same direction as the velocity=
you will speed up.Also calledpositive acceleration .
-If the acceleration is in the different direction as the
velocity = you will slow down. Also callednegative
accelerationordeceleration .
5.
The amount of acceleration depends on both change in velocity
and time interval.Time interval is the amount of time that passed
while the change in velocity was taking place.
6. Acceleration Constant Speed or Resting Deceleration A C B 7.
Calculating Acceleration
Variable Ending Unit
a = acceleration m/s 2 orkm/hr 2
t = time sec.orhr.
v f = final velocitym/sorkm/hr
v i = start velocitym/sorkm/hr
8.
a= V final V initial
time
9.
Ex:A swimmer speeds up from 1.1 m/s to 1.3 m/s during the last
20 sec. of a workout.What is the swimmers acceleration during this
time interval?
10.
Ex:While walking to school, you approach an intersection and
slow down from 2 m/s to a stop in 3 sec.What was your acceleration
during this time interval?
