Statics and Dynamics Quiz
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A uniform disk of mass m and radius r slides on a frictionless horizontal surface. A string wrapped around the disk's rim is pulled with a horizontal force F tangent to the rim, causing the disk's center G to accelerate and the disk to spin with angular acceleration α.
On the kinetic diagram of the disk, a student places maG at the center of mass directed in the direction of F, and also a couple IGα consistent with the string pull. A second student argues that since the only horizontal external force is F, the equation F=maG fully describes the kinetics, and adding the couple IGα to the kinetic diagram double-counts the effect of F. Which assessment is correct?
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