Applied Mechanics and Graphic Statics
Lami's theorem states that

If three forces acting on a point can be represented in magnitude and direction by the sides of a triangle, the point will be in the state of equilibrium
Three coplanar forces acting at a point will be in equilibrium if each force is inversely proportional to the sine of the angle between the other two
Three coplanar forces acting at a point will be in equilibrium, if each force is proportional to the sine of the angle between the other two
Three forces acting at a point are always in equilibrium

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Applied Mechanics and Graphic Statics
Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

Is directly proportional to their velocity of approach
Is equal to the sum of their velocities of approach
Is inversely proportional to their velocity of approach
Bears a constant ratio to their velocity of approach

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Applied Mechanics and Graphic Statics
The following is in unstable equilibrium

A uniform solid cone resting on a generator on a smooth horizontal plane
A uniform solid cone resting on its base on a horizontal plane
A solid cube resting on one edge
A satellite encircling the earth

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