Section 2 - Rigid Body Equilibrium 1. (5 pts) Concerning the free-body diagram o

Question

Section 2 - Rigid Body Equilibrium 1. (5 pts) Concerning the free-body diagram of lever ABC, if the spring force is known, determine the single equation of equilibrium that will allow to solve for the force in the reaction at A. 230 180 330 F. sum moments about A G. sum forces in the horizontal direction H. Sum moments about B I. sum forces in the vertical direction J. sum moments about C 2. (5 pts) For the same system, determine how many unknowns there are on the free-body-diagram of lever ABC. A. B. C. D. E. 4

Explanation / Answer

1. Answer: (H) sum of moments about B,

As there is a normal reaction at A, when we take moment about B, there are two forces, one is spring force and other is reaction at A which causes moment at B. This creates an equation having only one unknown, i.e. reaction at A, and thus can be found easily.

2. Answer: (A)

number of unknowns = 2(Pin B) + 1( Normal reaction at A) = 3 total.

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