MEC 122 Theory Questions: Moments of Force and Calculating Support Reactions

100 Level Mechanical Engineering Department exam questions and detailed answers. Download the answers in document format. Correct, detailed, and straightforward answers.

Questions:

a) What is moment of a force?

b) A uniform, wooden lathe AB, 120cm long and weighing 1.20N, rests on two sharp-edge supports C and D placed 10cm from each end of the lathe respectively. A 0.20N weight hangs from a loop of thread 30cm from A, and a 0.90N weight hangs similarly 40cm from B. Find the reactions at the supports.

IOCM  20CM  30CM  20CM  30CM  10CM  
-----!-----!-----!-----!-----!-----!------
A      C     0.20N 1.20N 0.90N A

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