Horizontal & Vertical Circular Motion Problems

Example 5: A 245 g mass is on the end of a 35 cm long string. Determine the tension in the string atthe top if the mass is spinning at 5.67 m/s.F c=F g+F TF T=F c−F gF T= −mv2 −mgrF T= −0.245(5.67)2 −0.245(−9.81)0.35F T=−24.90768=−24.9 NNotice there is a minus sign inserted onthe centripetal force term. This is becausewe know centripetal points downwardswhen we are at the top of the circle.Homeworkp.259 #1-3p.262 #1p.264 #17/15/2014 © studyphysics.ca Page 5 of 5 / Section 5.2