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Objective: To differentiate between speed and acceleration. Key Terms: speed average speed instantaneous speed acceleration . DO NOW . Take out your homework. Take 5 minutes to prepare for your quiz . SPEED .

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DO NOW

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  1. Objective: To differentiate between speed and acceleration. Key Terms: speed average speed instantaneous speed acceleration DO NOW Take out your homework. Take 5 minutes to prepare for your quiz

  2. SPEED • Speed is the ratio of the distance an object moves to the amount of time the object moves. • Average speed is computed for the entire trip while instantaneous speed is measured at a particular instant.

  3. Average Speed • Average speed is calculated by dividing the total distance travelled by the total time it took.

  4. Instantaneous Speed • The rate at which an object is moving at a given instant in time. • The reading on a car speedometer is an example of instantaneous speed.

  5. Graphing Motion • The slope of a line on a distance versus time graph is speed.

  6. Velocity • Description of both speed and direction of motion • Velocity is combined by vector addition

  7. Recap • What is the difference between instantaneous and average speed? • How do we calculate speed?

  8. Homework • Pg 337 #1-9

  9. DO NOW Objective: To be able to calculate speed and acceleration. • Take out your homework • What is the difference between average speed and instantaneous speed?

  10. Acceleration • Can be described as a change in speed, changes in direction, or changes in both. Acceleration is a vector. • An example of acceleration due to a change in speed is freefall. • An example of acceleration due to a change in direction is riding a bicycle around a curve. • Constant acceleration is a steady change in velocity.

  11. Calculating Acceleration • Acceleration = change in velocity/time • Unit is m/s2

  12. Graphing Acceleration • The slope of a speed versus time graph is acceleration. • A positive slope shows an increase in acceleration, a negative slope shows a decrease in acceleration, and a flat line shows constant speed.

  13. DO NOW • PREPARE FOR YOUR TEST

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