Equilibrium and Moments Flashcards
State the principle of moments.
For a body in rotational equilibrium the sum of the anti-clockwise moments is equal to the sum of the clockwise moments about the same point.
Define the centre of gravity.
An imaginary point where the entire weight of an object may be considered to act.
Define equilibrium.
A body is in equilibrium when the net force and net moment acting on it is zero.
Define the centre of mass.
A point through which any externally applied force produces straight-line motion but no rotation.
Define the moment of a force.
The product of a force and the perpendicular distance from the line of action of the force to the axis or point of rotation, M= Fd.
Define a couple.
A pair of equal and opposite forces acting at points separated by a distance, which only cause rotation.
Define Torque of a couple.
The force multiplied by the perpendicular distance between the forces.
