Applied Mechanics and Graphic Statics
Pick up the incorrect statement from the following. In a simple harmonic motion

Velocity is minimum at the end of the stroke
Acceleration is zero at the mean position
Acceleration is minimum at the end of the stroke
Velocity is maximum at its mean position

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

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

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