4.5 Moments and Equilibrium
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4 Terms
What is the moment of a force
The turning effect of a force about some axis or point .
Moment = force × perpendicular distance of action of force from the axis or point of rotation.
Moment = Fx
The unit is Nm
You can use trigonometry to find the perpendicular distance
What is the principle of moments?
When a body us in equilibrium, the net force acting on it is zero and its net moment is zero.
For a body is rotational equilibrium, the sum of the anticlockwise moments about any point is equal to the sum of the clockwise moments about that same point.
What are couples?
A pair of parallel forces that are along different lines.
What is torque?
The moment of a couple.
Moment = (F × d/2) + (F × d/2) = Fd
F = Force
d = perpendicular distance
Torque of a couple = one of the forces × perpendicular separation between the forces = Fd.
Note 
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