explanation9.pdf - Module 3: Week 9 Rotational Dynamics and...

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Module 3:Week 9 Rotational Dynamicsand Balance
Module 1Balancing a RodActivity 1 – To be submitted as individual workConsider the rod shown in the diagram below.The rod has mass࠵?and length࠵?.The rod is uniform (its mass is evenlydistributed).A pivot is placedL/3 from the left-hand edge:Indicate whichBig Ideaand theJustificationyou would use to answer the questions inthe table.QuestionQuestion 1:What is the moment of inertia࠵?of this rod about the pivot in the diagram?Big Idea & Justification:Parallel Axis Theorem
2
Question 2:What is thetorque due to gravityabout the pivot in the diagram?
Question 3:Where along the rod, on the left-hand side of the pivot, would you push with a forceF to balance the rod?
Question 4:How would you calculate the angular acceleration of the rod about the pivot shown ifreleased from rest?
Module 3, Week 93Angular Momentum:The Child and the Merry-Go-RoundActivity 2 – To be submitted as individual workA circular merry-go-round has a child standing at its center.The child’s parent gives the merry-go-round a push and sets it in motion going counter-clockwise at an angular velocity of ω=2.3 rad/s.The child thenstarts walking toward the rimof the merry-go-round.QuantityValue࠵?!"##$%&’%#’()*125kg-m+࠵?,-./*40kg࠵?1.5m࠵?02.3 rad/sIdentify the Big Idea(s) and Justification(s) that apply to finding the final angular speedof the merry-go-round when the child reaches the rim.

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Term
Fall
Professor
KevinPitts
Tags
Angular Momentum, Moment Of Inertia, Angular Kinematics Review

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