A moment is the turning effect of a force: = force x perpendicular distance from pivot to line of action (f x s = Nm)
The principle of moments states that for an object in equilibrium... sum of clockwise moments = sum of anticlockwise moments
Centre of mass: is the point at which the weight of the body can be considered to act (It can also be described as the point at which the turning effect/moment/torque is equal to 0)
Torque: The tendancy of a force to rotate about a an axis.
Couple: Tries to turn something about an axis. Two forces equal in magnitude, acting in opposition directions, parrallel to one another, equidistant from the point of rotation. Mangnitude = one force x total distance between them (Nm) The moment of a couple, sometimes called the Torque
Support problems: clockwise = anticlockwise (X x D1 = Y x D2)
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