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Chapter 9

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Chapter 9

Section 3 – pg 350

Acceleration

Pg 350

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

Pg 351

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

Pg 351

- 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

Pg 352

- 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

Pg 354

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

Pg 354

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

Pg 355

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