Applied Mechanics and Graphic Statics
To double the period of oscillation of a simple pendulum

The mass of its bob should be quadrupled
The mass of its bob should be doubled
Its length should be quadrupled
Its length should be doubled

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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 depends upon the roughness of the surface
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

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