## Applied Mechanics and Graphic Statics A body is said to move with Simple Harmonic Motion if its acceleration, is

Inversely proportion to the distance from the point of reference
Always directed away from the centre, the point of reference
Proportional to the square of the distance from the point of reference
Proportional to the distance from the point of reference and directed towards it

e*72
e4*
e2*
1

6 J
8 J
4 J
2 J

## Applied Mechanics and Graphic Statics The Law of Polygon of Forces states that

If a polygon representing the forces acting at point in a body is closed, the forces are in equilibrium
If forces acting on a point can be represented in magnitude and direction by the sides of a polygon taken in order, then the resultant of the forces will be represented in magnitude and direction by t
If forces acting on a point can be represented of a polygon taken in order, their sides of a polygon taken in order, their resultant will be represented in magnitude and direction by the closing side
If forces acting on a point can be represented in magnitude and direction by the sides of a polygon in order, the forces are in equilibrium

## Applied Mechanics and Graphic Statics The following is in unstable equilibrium

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

45°
30°
90°