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Convention
To work out the moment of a force you times the force by the distance the force is from the pivot. So, basically: Moment = force x distance.
It is common convention to take a force directed 'up' as positive, this gives a counter clock wise moment a positive value.
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bending moment varies with the distance & the load carried by the beam. And also there is a hogging behavior and a sagging behavior occurs in the beam. According to the sign convention hogging and sagging bears opposite signs.(- & +). So if we are asked to find the maximum bending moment whether it is sagging or hogging we should consider the maximum value without considering the sign. That value is called maximum absolute bending moment.
A moment of a force is a measurement of the turning effect of that force. For example, the force of a hand pushing down on a door handle creates a turning effect, and is therefore described as a moment.
moment depends upon the force and the perpendicular distance between the force and the point where we are finding the moment. so when moment changes either the force will change or the perpendicular distance will change.
we can show moment arm as r=torque divide by force.
No, a moment is a force x a distance, it is the product of a force and a distance. You get the same moment with a force of say 2 Newtons at 0.5 meter as a force of 1 Newton at 1 meter, so it is obviously not a force alone, but the product of a force and a distance, and its units are Newton.meters in the SI system
The turning effect, caused from force, is called The moment of a force.
in the convention in phillidelphia
On SFD's and BMD's: The shear force will be 0, the shear force is the derivative of the bending moment at a point on shear force and bending moment diagrams. Otherwise: It depends on the loading.