differentiate between force and moment of force
Answers
Answer:
Moment vs Couple
Moment of force and couple are two important concepts found in mechanics. These describe the effect and cause of rotation in force systems, particle systems, and in rigid bodies. Moment of a force governs many of the rotational properties of the systems. From a certain perspective, it is the equivalent of the force in rotational dynamics.
Moment
Moment or more precisely the moment of a force is a measure of the turning effect of a force. Moment of force is measured in Newton meters (Nm) in the SI system, which looks similar to the unit of mechanical work but carries completely different meaning.
When a force is applied it creates a turning effect about a point other than on the line of action of the force. The amount of this effect or the moment is directly proportional to the magnitude of the force and the perpendicular distance to the force from the point.
Moment of a force = Force × Perpendicular distance from the point to force
Moment τ = F × x
If a force system has no resultant moments, i.e. ∑τ = 0 , the system is in rotational equilibrium.
When the moment of a force has a physical sense it is often called “torque”.
Couple
When two equal and opposite forces, but with separate lines of action are present in a force system it is called a couple. Both forces create their own moment of force, but the net moment of the couple is independent of the location of the point considered.
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