Applied Mechanics and Graphic Statics
The ratio of kinetic energy and potential energy of a simple harmonic oscillator, at a displacement equal to half its amplitude is given by

0.043055555555556
0.042361111111111
0.12569444444444
0.084027777777778

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Applied Mechanics and Graphic Statics
The following is not a law of static friction:

The force of friction is dependent upon the area of contact
The force of friction always acts in a direction opposite to that in which the body tends to move
The magnitude of the limiting friction bears a constant ratio to the normal reaction between two surfaces
The force of friction depends upon the roughness of the surface

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