Chapter 9
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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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Chapter 9

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Chapter 9

Chapter 9

Section 3 – pg 350

Acceleration


Changing velocity

Pg 350

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

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


Changing direction

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


Calculating acceleration

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


Graphing acceleration

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


Speed vs time graph

Pg 354

Speed-vs-Time Graph

  • Constant slope means a constant acceleration

  • No slope means a constant velocity and no acceleration


Distance vs time graph

Pg 355

Distance-vs-Time Graph

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


Chapter 9 section 3 homework pg 355

Chapter 9 Section 3Homework – pg 355


1a what are the three ways that an object can accelerate

1A. What are the three ways that an object can accelerate?


1b describe how a baseball player accelerates as he runs around the bases after hitting a home run

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


Chapter 9

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

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


Chapter 9

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

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

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

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


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