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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

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
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.
slide13
1C. An ice skater glides around a rink at a constant speed of 2 m/s.Is the skater accelerating?Explain your answer.
slide15
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?