Question 4.17: Representing a Force by a Force and Couple System 1 in Fig. ...

Engineering Mechanics: Statics

Representing a Force by a Force and Couple

System 1 in Fig. 4.43 consists of a force $F_{A} = 10i + 4j – 3k (lb)$ acting at A. Represent it by a force acting at B and a couple.

Strategy
We want to represent the force $F_{A}$ by a force F acting at B and a couple M (system 2 in Fig. a). We can determine F and M by using the two conditions for equivalence.

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