Rotational Dynamics of Rolling Motion Video Lessons

Concept

# Problem: A spool is being unwound by a constant force F pulling on a string. The spool rolls without slipping. The spool has a radius r, mass m and moment of inertia I =2/3 mr2. If the spool rolls without slipping, what is the ratio of the magnitude of the applied force F to the magnitude of the friction force f, F/f? 1. 2/3 2. 1/5 3. 3/2 4. 1/7 5. 1 6. 1/3 7. 7 8. 5 9. 5/3 10. 3/5

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###### Problem Details

A spool is being unwound by a constant force F pulling on a string. The spool rolls without slipping. The spool has a radius r, mass m and moment of inertia I =2/3 mr2. If the spool rolls without slipping, what is the ratio of the magnitude of the applied force F to the magnitude of the friction force f, F/f?

1. 2/3

2. 1/5

3. 3/2

4. 1/7

5. 1

6. 1/3

7. 7

8. 5

9. 5/3

10. 3/5

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