The Islamic University of Gaza
Faculty of Engineering - Mechanical Engineering Department
Dynamics EMEC 2306
4th MidTerm Exam
Closed Book
Lecturer: Mohammad Abuhaiba, Ph.D., P.E.,
14/4/2014
TA: Eng. Hanan Eshraim
Problem #1:
Crank AB of the engine system has a constant ccw angular velocity of 160 rad/s. For the crank
position shown,
1. What is the type of motion of the crank AB, the connecting rod BD, and the piston P ?
2. Locate the instant center of the crank AB
3. Locate the instant center of the connecting rod BD
4. Locate the instant center of the piston P
5. Determine the angular velocity of the connecting rod BD
6. Determine the velocity of the piston P
7. Determine the angular acceleration of the connecting rod BD
8. Determine the acceleration of the piston P
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Problem #2:
The center of the double gear has a velocity and acceleration to the right of 2 m/s and 4 m/s2,
respectively. The lower rack is stationary.
1. What is the type of motion of the rack “R”, and the double gear ?
2. Locate the instant center of the upper rack “R”
3. Locate the instant center of the double gear
4. Determine the angular velocity of the double gear
5. Determine the velocity of points B, C, D
6. Determine the angular acceleration of the double gear
7. Determine the acceleration of points B, C, D
VA = 2 m/s
aA = 4 m /s2
r1 =80 mm
r2 = 40 mm
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