319_Physics ProblemsTechnical Physics

319_Physics ProblemsTechnical Physics - Chapter 10 P10.87...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 10 321 P10.87 Rolling is instantaneous rotation about the contact point P . The weight and normal force produce no torque about this point. Now F 1 produces a clockwise torque about P and makes the spool roll forward. Counterclockwise torques result from F 3 and F 4 , making the spool roll to the left. The force F 2 produces zero torque about point P and does not cause the spool to roll. If F 2 were strong enough, it would cause the spool to slide to the right, but not roll. F 1 F 2 F 3 F 4 θ c P FIG. P10.87 P10.88 The force applied at the critical angle exerts zero torque about the spool’s contact point with the ground and so will not make the spool roll.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online