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Forces in equilibrium (Vectors and scalars (Addition of two perpendicular…
Forces in equilibrium
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The principle of moments
Centre of mass
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Th centre of mass of a body is the point through which a single force on the body has no turning effect
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Turning effects
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The moment of a force about any point is defined as the force X the perpendicular distance from the line of action to the force of the point
Stability
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When a body at stable equilibrium is at rest, its centre of mass is directly below the point of support
If a body in stable equilibrium is released, it returns to its equilibrium position
More on moments
Couples
The total moment is the same, regardless of the point about which the moments are taken
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A pair of equal and opposite forces acting on a body, but not acting upon the same line
Two-support problems
If the centre of mass is closer to x than y, the
dx<dy and Sy<Sx
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