Discussion Questions 4(a) Construct the FBD of the bridge shown below. Each member of the bridge is of 10 meters long and the inclination of the bridge is 15°. The weight of the bridge is 5000N and is acted at the mid- point of the bridge. Determine the normal reaction forces at point A and D.
4(b) Determine the total frictional force (point A and D) of the bridge at impending motion. You can assume the coefficient of statics friction between the bridge and the ground is 0.60. Is the bridge able to maintain statics equilibrium without falling into the cliff? Why? [Hint: compare with the total frictional force under statics equilibrium] [10 marks]
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