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STATICS
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EQUILIBRIUM OF A PARTICLE
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Particle A moves to right when F1 > F2
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Closed Polygon Of Forces
Triangle of Forces
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First Case
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METHOD OF VECTOR ADDITION
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METHOD OF RESOLVING FORCES
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Second Case
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METHOD OF VECTOR ADDITION
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METHOD OF RESOLVING FORCES
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Third Case
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EQUILIBRIUM OF A RIGID BODY
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Moment of force or torque ( ) = r x F
Magnitude = r F sin θ
Where, r is the position vector for point of action of force from theAxis of rotation and F is the force
Point of action of force
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Moment of forces Fr
10 Nm 10 NmAnticlockwise direction (-ve)Clockwise direction ( +ve)
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Torque = F x AB
Or ,Torque = F x BA
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Action Of Coplanar Forces on A Rigid Body
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Case one
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FRICTIONAL FORCES• Understand that the action of frictional forces maintains a body in equilibrium.•Understand that the frictional force is a force which has a maximum value of μR
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Graph shows a linear relationship between Fs against R
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• EQUILIBRUM OF PARTICLE.• EQUILIBRIUM OF RIGID BODIES.• FRICTION FORCE
EXAMPLES
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MOMENT AND TORQUE
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Pivot
O
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FRICTION FORCE
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