Unit 1 Lesson 2 Acceleration

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Presentation transcript:

Unit 1 Lesson 2 Acceleration Copyright © Houghton Mifflin Harcourt Publishing Company

Getting up to Speed How do we measure changing velocity? Unit 1 Lesson 2 Acceleration Getting up to Speed How do we measure changing velocity? Acceleration is the rate at which velocity changes. An object accelerates if its speed, direction, or both change. Acceleration depends on how much velocity changes and how much time that change takes. Copyright © Houghton Mifflin Harcourt Publishing Company 2

How do we measure changing velocity? Unit 1 Lesson 2 Acceleration How do we measure changing velocity? What is the change in velocity for each second of time that passes? Copyright © Houghton Mifflin Harcourt Publishing Company 3

How is average acceleration calculated? Unit 1 Lesson 2 Acceleration How is average acceleration calculated? Average acceleration = (final velocity – starting velocity)/time a = (v2 – v1)/t Acceleration is measured in meters per second squared (m/s2). Copyright © Houghton Mifflin Harcourt Publishing Company 4

What a Drag! How can accelerating objects change velocity? Unit 1 Lesson 2 Acceleration What a Drag! How can accelerating objects change velocity? Acceleration refers to both increases and decreases in speed. A change in direction is also acceleration. An increase in velocity is called positive acceleration. A decrease in velocity is called negative acceleration. Copyright © Houghton Mifflin Harcourt Publishing Company 5

How can accelerating objects change velocity? Unit 1 Lesson 2 Acceleration How can accelerating objects change velocity? Is the horse showing negative acceleration or positive acceleration? Explain. Copyright © Houghton Mifflin Harcourt Publishing Company 6

How can accelerating objects change velocity? Unit 1 Lesson 2 Acceleration How can accelerating objects change velocity? An object traveling in a circular motion is always changing its direction, and so it always experiences acceleration. Centripetal acceleration is acceleration in a circular motion. Copyright © Houghton Mifflin Harcourt Publishing Company 7