Acceleration!

1 / 11

# Acceleration! - PowerPoint PPT Presentation

Acceleration!. Chapter 9 Section 3. Acceleration. Let’s Review: What is Speed? Velocity? What is a Vector? Acceleration : RATE at which velocity changes Refers to INCREASING speed, DECREASING speed, or CHANGING direction . Is Acceleration a Vector?

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

## PowerPoint Slideshow about 'Acceleration!' - christmas

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

### Acceleration!

Chapter 9 Section 3

Acceleration

Let’s Review: What is Speed? Velocity? What is a Vector?

• Acceleration: RATE at which velocity changes
• Refers to INCREASING speed, DECREASING speed, or CHANGING direction.
Is Acceleration a Vector?

A softball accelerates when it is thrown, hit, or caught. What change in motion occurs in each example?

Thrown- ball accelerates as it is thrown

Hit- ball changes direction

Caught- ball decelerates (negative acceleration)

How can a car be accelerating if its speed is constant at 65 km/h?

The arrows are larger as the plane increases speed or accelerates…the arrows represent the vector quantity.

### BRAIN BREAK!

Acceleration is like…Because…

Now, let’s play Gotcha!

Calculating Acceleration

Final Velocity-Beginning Velocity

Time

Final Velocity

Beginning Velocity

Fv-Bv

a =

t

Time

Example:

As a roller coaster starts down a slope, its velocity is 4 m/s. But 3 seconds later, its velocity is 22 m/s in the same direction. What is its acceleration?

Initial Velocity: 4 m/s

Final Velocity: 22 m/s

Time: 3 s

Final Velocity – Initial Velocity/ Time

22 m/s – 4 m/s

3 s

18 m/s = 6 m/s/s or 6 m/s2

3 s

Graphing Acceleration
• Speed vs. Time Graph
• Upward means speed is increasing

Line is straight means acceleration is constant

• A horizontal line (flat) would mean that the object is moving at a constant speed.
• Slope on a speed vs. time graph represents acceleration
Distance vs. Time Graph
• Curved line means that the objects is accelerating (nonlinear).
• During each second, the object traveled a greater distance than the second before.
• Slope is speed and since slope is getting steeper and steeper, you can conclude that speed is also increasing…or that the object is accelerating.