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# Acceleration (1) notes

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### Acceleration (1) notes

1. 1. <ul><li>When an object undergoes acceleration , its velocity changes. </li></ul><ul><li>Acceleration the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change. </li></ul><ul><li>Acceleration can be a change in speed or a change in direction . </li></ul>
2. 2. <ul><li>When an object undergoes acceleration , its velocity changes. </li></ul><ul><li>Positive acceleration is in the same direction as the motion and increases velocity. </li></ul><ul><li>The basketball player </li></ul><ul><li>accelerates at 5 m/s/s </li></ul><ul><li>upward. </li></ul>
3. 3. Linear Acceleration <ul><li>When an object slows down it is losing speed. This is called Negative Acceleration or Deceleration . </li></ul><ul><li>This is really acceleration in the backward direction. </li></ul>
4. 4. <ul><li>Moving in a circle at constant speed is acceleration because you are constantly changing direction. </li></ul><ul><li>The acceleration that occurs in a circular motion is known as centripetal acceleration . </li></ul><ul><ul><ul><ul><ul><li>Stock cars are constantly accelerating around the </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>track. </li></ul></ul></ul></ul></ul>
5. 5. <ul><li>Equation acceleration = final velocity – initial velocity </li></ul><ul><li>time </li></ul><ul><li>what does this mean? </li></ul><ul><li>Or a = v </li></ul><ul><li>t </li></ul><ul><li>Units of acceleration: m/s/s, m/s 2 , km/h/s, mi/hr/s </li></ul><ul><li>The average acceleration over a given time interval can be calculated by dividing the change in the object’s velocity by the time over which the change occurs. </li></ul>
6. 6. <ul><li>Natalie accelerates her skateboard along a straight path from 0 m/s to 4.0 m/s in 2.5 s. Find her average acceleration </li></ul><ul><li>List what you know : Plug into your equation </li></ul><ul><li>Fina l velocity = 4.0 m/s a= V final - V initial / time </li></ul><ul><li>Initial velocity = 0 m/s 4.0 m/s – 0 m/s </li></ul><ul><li>Time = 2.5 s 2.5 s </li></ul><ul><li>Acceleration = ? A = </li></ul>
7. 7. Practice Calculating Acceleration <ul><li>If Annie goes from 0m/s to 8 m/s in 1 sec. What is her acceleration? </li></ul><ul><li>Tanner ran 0m/s to 10m/s in 1 sec. What is his acceleration? </li></ul><ul><li>Sam’s new Mercedes goes from 0m/s to 30 m/s in 6 sec. What is its acceleration? </li></ul><ul><li>Catlin’s jet accelerates from a stop to 76 m/s in 10 sec. What is its acceleration? </li></ul>
8. 8. The top fuel cars are traveling 298.1 mph in 3.055 seconds, what is their acceleration?
9. 10. <ul><li>What is the acceleration at 3 seconds? </li></ul><ul><li>What is the acceleration at 8 seconds? </li></ul>