The collar of mass m is released from rest whilein position A and subsequently travels

Chapter 3, Problem 3/120

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The collar of mass m is released from rest while in position A and subsequently travels with negligible friction along the vertical-plane circular guide. Determine the normal force (magnitude and direction) exerted by the guide on the collar  (a) just before the collar passes point B,  (b) just after the collar passes point B (i.e., the collar is now on the curved portion of the guide),  (c) as the collar passes point C, and  (d) just before the collar passes point D. Use the values \(m=0.4 \mathrm{~kg}\), \(R=1.2 \mathrm{~m}\), and \(k=200 \mathrm{~N} / \mathrm{m}\). The unstretched length of the spring is 0.8R.