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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

Section 3 – pg 350


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


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

Chapter 9 Section 3Homework – pg 355

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.

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?

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?

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)?

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