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

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

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Applied Mechanics and Graphic Statics
The force acting on a point on the surface of a rigid body may be considered to act

On any point on the line of action of the force
On the periphery of the body
At the centre of gravity of the body
At any point on the surface normal to the line of action of the force

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