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Vocabulary Acceleration: The rate at which velocity changes Constant acceleration: A steady change in velocity Announcements:

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Science 8 th Grade

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S8P3. Students will investigate relationship between force, mass, and the motion of objects. a. Determine the relationship between velocity and acceleration. (DOK 2)

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It is a rate! Let’s try this one more time…what is a rate? Right…right… What is changing? Velocity Standard unit: meters per second squared (m/s 2 )

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Speed! Positive acceleration Positive change in speed Increase speed Negative acceleration Negative change in speed Decrease speed

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Speed and direction Yes, changing at the same time.

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From the vocabulary, we know it is steady change in velocity Essentially, a constant rate change in velocity Or…velocity is changing the same amount each second www.youtube.com /watch?v=BGfPU_g yqm8 www.youtube.com /watch?v=BGfPU_g yqm8

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a = v f – v i t a – acceleration v f – final velocity v i – initial velocity t – time Units? Try some problems.

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1. A car traveling at 10 m/s starts to decelerate steadily. It comes to a complete stop in 20 seconds. 2. An airplane travels down the runway for 4.0 seconds with an acceleration of 9.0 m/s 2.

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Demonstrated on a speed vs. time graph The slope demonstrates acceleration Or…increasing or decreasing slope of distance-time graph

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Explain how acceleration is considered a rate? It is a vector too… what does that mean? What kind of graph shows acceleration?

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