QUIZ 2
COURSE
:
DYNAMICS
COURSE CODE
:
BMM1223
COURSE COORDINATOR
:
NOR ATIQAH ZOLPAKAR
DATE
:
29 DECEMBER 2021
DURATION
:
1 HOUR
SESSION/SEMESTER
:
SESSION 2020/2021 SEMESTER II
INSTRUCTIONS TO CANDIDATES:
1.
This examination paper consists of TWO (2) questions. Answer ALL questions.
2.
All answers to a new question should starts on a new page.
3.
All the calculations and assumptions must be clearly stated.
EXAMINATION REQUIREMENTS:
NIL
APPENDIX:
NIL
QUESTION 1 [10 MARKS]
The 20 kg roll of paper has a radius of gyration kA = 85 mm about an axis passing through point
A. It is pin supported at both ends by two brackets AB. If the roll rests against a wall for which the
coefficient of kinetic friction is μk = 0.25 and a vertical force F = 30 N is applied to the end of the
paper, determine the angular acceleration of the roll as the paper unrolls.
Figure 1
QUESTION 2 [10 MARKS]
The 5-kg rod AB is pin-connected at A and subjected to a couple moment of M = 15 Nm. If the
rod is released from rest when the spring is unstretched at ϴ = 30°, determine the total work done
at the instant ϴ = 60°. As the rod rotates, the spring always remains horizontal, because of the
roller support at C.
Figure 2