Tutorial3

Tutorial3 - Tutorial 3 MECH 101 Liang Tengfei...

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Tutorial 3 MECH 101 Liang Tengfei tfliang@ust.hk Office phone : 2358-8811 Mobile : 6497-0191 Office hour : 14:00-15:00 Fri 1
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Outline Some typical problems from HW How to solve internal force? Joint problem
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HW 1-Problem #1 4-53 . The tool is used to shut off gas valves that are difficult to access. If the force F is applied to the handle, determine the component of the moment created about the z axis of the valve.   l ll   M r F o  M r F lo  MM Start point O on the axis, end point on the line of application of the force
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HW 1-Problem #2 4-108 . Replace the two forces by an equivalent resultant force and couple moment at point O . set F =75N R If you don’t move R to point O, there is no extra couple added on point O. Usually we use counter-clockwise as the positive direction of the moment. o R  Mr Force can only be moved along its line of application Right hand rule
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HW 1-Problem #3 4-125 . Replace the force system acting on the frame by an equivalent
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Tutorial3 - Tutorial 3 MECH 101 Liang Tengfei...

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