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# 2 velocity and acceleration

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### 2 velocity and acceleration

1. 1. Velocity and Acceleration
2. 2. <ul><li>Velocity - describes speed and the direction of an object. </li></ul><ul><li>-Velocity can change. It can change even if the speed of the object remains constant. </li></ul><ul><li>Ex: Car going around a curve. Speed is same but velocity changes (direction changes) </li></ul>
3. 3. <ul><li>Acceleration- the rate of change of velocity. </li></ul><ul><li>-Acceleration can occur through a change in speed or in direction. </li></ul>
4. 4. <ul><li>-If the acceleration is in the same direction as the velocity= you will speed up. Also called positive acceleration . </li></ul><ul><li>-If the acceleration is in the different direction as the velocity = you will slow down. Also called negative acceleration or deceleration . </li></ul>
5. 5. <ul><li>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. </li></ul>
6. 6. Acceleration Constant Speed or Resting Deceleration A C B
7. 7. Calculating Acceleration <ul><li>Variable Ending Unit </li></ul><ul><li>a = acceleration m/s 2 or km/hr 2 </li></ul><ul><li>t = time sec. or hr. </li></ul><ul><li>v f = final velocity m/s or km/hr </li></ul><ul><li>v i = start velocity m/s or km/hr </li></ul>
8. 8. <ul><li>a = V final – V initial </li></ul><ul><li> time </li></ul><ul><li> </li></ul>
9. 9. <ul><li>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 swimmer’s acceleration during this time interval? </li></ul>
10. 10. <ul><li>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? </li></ul>