STATICS
EQUILIBRIUM OF A PARTICLE
Particle A moves to right when F1 > F2
Closed Polygon Of Forces
Triangle of Forces
First Case
METHOD OF VECTOR ADDITION
METHOD OF RESOLVING FORCES
Second Case
METHOD OF VECTOR ADDITION
METHOD OF RESOLVING FORCES
Third Case
EQUILIBRIUM OF A RIGID BODY
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
Moment of forces Fr
10 Nm 10 NmAnticlockwise direction (-ve)Clockwise direction ( +ve)
Torque = F x AB
Or ,Torque = F x BA
Action Of Coplanar Forces on A Rigid Body
Case one
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
Graph shows a linear relationship between Fs against R
• EQUILIBRUM OF PARTICLE.• EQUILIBRIUM OF RIGID BODIES.• FRICTION FORCE
EXAMPLES
MOMENT AND TORQUE
Pivot
O
FRICTION FORCE