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# Acceleration

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### Acceleration

1. 1. Acceleration
2. 2. I. Changing an object’s motion <ul><li>Your trip to school each morning requires that you change motion. You do not travel in a straight line at a constant speed </li></ul><ul><li>There are three ways to change an object’s motion </li></ul><ul><li>Change speed </li></ul><ul><li>Change direction </li></ul><ul><li>Or both </li></ul><ul><li>What parts of a car can change an object’s motion?? </li></ul>
3. 3. II. Changing velocity <ul><li>The rate at which the velocity is changing is called acceleration . </li></ul><ul><li>Acceleration is basically how much you speed up or slow down in a given amount of time </li></ul><ul><li>Acceleration is measured in m/s 2 </li></ul><ul><li>Acceleration is not just for speeding up, but also for slowing down. </li></ul><ul><li>This is often called deceleration or negative acceleration </li></ul>
4. 4. III. Velocity-time graph <ul><li>Acceleration can be found from a v-t graph just like we found velocity from a d-t graph. </li></ul><ul><li>By finding the slope of the line you can find the acceleration, or change in speed, of an object. </li></ul><ul><li>If the v-t graph has a straight line, then the acceleration is constant. </li></ul><ul><li>If the v-t graph has a curved line, then the acceleration is not constant. </li></ul>
5. 5. IV. D-t AND v-t graphs <ul><li>See examples on the board. </li></ul>