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# Chapter 9 - PowerPoint PPT Presentation

Chapter 9. Section 3 – pg 350 Acceleration. Pg 350. Changing Velocity. Acceleration: the rate at which velocity changes with time Acceleration refers to increasing speed, decreasing speed, or changing direction. Pg 351. Increasing and Decreasing Speed.

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## PowerPoint Slideshow about ' Chapter 9' - yakov

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### Chapter 9

Section 3 – pg 350

Acceleration

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.

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?