Chapter 9

1 / 18

# 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.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'Chapter 9' - yakov

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

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

Pg 351

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

Pg 352

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

Pg 354

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

Pg 354

Speed-vs-Time Graph
• Constant slope means a constant acceleration
• No slope means a constant velocity and no acceleration

Pg 355

Distance-vs-Time Graph
• A curved line on a distance-vs-time graph shows acceleration because velocity is not constant
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?