CHAPTER 9 SECTION 3: Acceleration. Acceleration is the rate at which velocity changes over time.

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CHAPTER 9 SECTION 3: Acceleration

Transcript of CHAPTER 9 SECTION 3: Acceleration. Acceleration is the rate at which velocity changes over time.

Page 1: CHAPTER 9 SECTION 3: Acceleration.  Acceleration is the rate at which velocity changes over time.

CHAPTER 9 SECTION 3:

Acceleration

Page 2: CHAPTER 9 SECTION 3: Acceleration.  Acceleration is the rate at which velocity changes over time.

Acceleration

Acceleration is the rate at which velocity changes over time.

Page 3: CHAPTER 9 SECTION 3: Acceleration.  Acceleration is the rate at which velocity changes over time.

An object accelerates if it’s speed, direction, or both change

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An increase in velocity is called positive acceleration

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A decrease in velocity is called deceleration or negative acceleration

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The faster the velocity changes, the greater the acceleration is.

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Average Acceleration = (Final Velocity – Starting Velocity) /

Time

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(eg) A plane passes over point A at a velocity of 240M/sec North. Forty seconds later, it passes over point B at a velocity of 260M/sec North. What is the plane’s AVG. Acceleration?

ave. acceleration = 260m/s - 240m/s = 0.5m/s²

40s

Page 9: CHAPTER 9 SECTION 3: Acceleration.  Acceleration is the rate at which velocity changes over time.

Acceleration can be shown on a graph as velocity versus time.

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Circular Motion

Because the Earth rotates, you are accelerating because you are changing direction

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An object in a circular path is always changing direction, therefore it’s velocity is always changing, so it is accelerating.

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Acceleration in a circular path is called centripetal acceleration

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(eg) Ferris wheel, Moon’s orbit, blades of a fan or windmill.