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Changing Velocity

- Acceleration: the rate at which velocity changes with time
- Acceleration refers to increasing speed, decreasing speed, or changing direction

Increasing and Decreasing Speed

- Whenever an object’s speed increases, the object accelerates
- When an object slows down it is called deceleration or negative acceleration

Changing Direction

- Acceleration may be due to changes in speed, direction, or both
- A object that is spinning at a constant speed is accelerating because it is constantly changing direction

Calculating Acceleration

- If an object is not changing direction, you can describe its acceleration as the rate at which its speed changes
- To determine the acceleration of an object, you must calculate its change in velocity per unit of time
- Acceleration = Final velocity – Initial velocity
Time

Graphing Acceleration

- You can use both a speed-vs-time graph and a distance-vs-time graph to analyze the motion of an accelerating object

Speed-vs-Time Graph

- Constant slope means a constant acceleration
- No slope means a constant velocity and no acceleration

Distance-vs-Time Graph

- A curved line on a distance-vs-time graph shows acceleration because velocity is not constant

Chapter 9 Section 3Homework – pg 355

1B. Describe how a baseball player accelerates as he runs around the bases after hitting a home run.

1C. An ice skater glides around a rink at a constant speed of 2 m/s.Is the skater accelerating?Explain your answer.

2A. What formula do you use to calculate the acceleration of an object moving in a straight line?

2B. The velocity of a cyclist moving in a straight line changes from 0 m/s to 15 m/s in 10 seconds. What is the cyclist’s acceleration?

3A. What types of graphs can you use to analyze the acceleration of an object?

3B. Describe the motion of an object if its speed-vs-time graph is a horizontal line

3C. What would a distance-vs-time graph look like for the moving object in part (b)?

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