Fig. 3.14(a) we see a force F to act at the point named A on the plane.

Fig. 3.14(b) we could see that at the point B, there are two forces which act on F and- F but that does not affect the body externally.

Fig. 3.14(c) we see that at point B, a force F acts at a clockwise moment M =- Fx.

This is because –F works at the point Band F acts at the point A. Thus it is evident that a couple of forces whose magnitude is Fx is clockwise.

Links of Previous Main Topic:-

• Introduction to statics
• Introduction to vector algebra
• Two dimensional force systems

Links of Next Mechanical Engineering Topics:-

• Resultant of a number of forces
• Three dimensional force systems
• Three dimensional moment and couple system
• Wrench resultant
• Introduction concept of equilibrium of rigid body
• Friction introduction
• Introduction about distributed forces

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