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Question

Figure shows a pair of pin jointed gripper tongs holding an object weighing 2000 N. The coefficient of friction μ at the gripping surface is 0.1. XX is the line of action of the input force and YY is the line of application of normal gripping force. If the pin-joint is assumed as frictionless, the magnitude of force F required to hold the weight (in N) is

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Solution



From FBD, for the weight to be in equilibrium,
2μN=2000
N=10000.1=10000 N
Equating moments about the hinge
F×30=N×15
F=5000 N

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