# act17 - Activity 17 Rotational Motion Part A When...

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Activity 17: Rotational Motion 3/25/08 Part A When describing circular motion, rotational variables θ , ω , and α are used. They are the angular equivalent to x, v, and a. We discussed the rotational variables and the relationships between them and the linear variables last class. For review answer the questions below. 1. Write a one sentence definition of θ , ω , and α . 2. What are the units of θ , ω , and α ? 3. What is a radian? 4. What is the relationship between θ and s (arc length)? 5. What is the relationship between ω and v (tangential velocity)? 6. What is the relationship between α and a t (tangential acceleration)? Part B 1. If a mass is traveling in a circular path at a constant speed, is it accelerating? Why? 2. In rotational motion we have two types of acceleration: tangential acceleration (a t ) and centripetal acceleration (a rad ). Which one describes the change of magnitude of the velocity? Which one describes the change of direction?

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act17 - Activity 17 Rotational Motion Part A When...

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