Worksheet 4 - Iowa State University

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Phys 221 SI Worksheet:
Circular Motion
Supplemental Instruction
Iowa State University
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Course:
Instructor:
Date:
Justin
Phys 221
Adhikari
9/8/15
1. What is ω? How does it relate to θ?
2. What are the three kinds of acceleration found in circular motion problem? What values
does each depend on?
3. An object has a frequency of 3rpm. What is the angular velocity in rad/s?
4. For an object with an angular velocity of 2rad/s, what radius is needed to have a
tangential velocity of 3.75m/s?
5. For an object with an angular velocity of 2rad/s, what radius is needed to have a
centripetal acceleration of 3.125m/s2?
6. For the same ω, how does the centripetal acceleration change when the radius is doubled?
7. For the same tangential velocity, how does the centripetal acceleration change when the
radius is doubled?
8. Astronauts sit in a chair that rotates in uniform circular motion, facing the center to
simulate high accelerations. If R=4m what rpm is required for the astronaut to experience
6g’s?
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