Applied Mechanics and Graphic Statics
Pick up the correct statement from the following. The kinetic energy of a body

Before impact is less than that after impact
Before impact is equal to that after impact
Before impact is more than that after impact
Remain constant

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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 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
The magnitude of the limiting friction bears a constant ratio to the normal reaction between two surfaces

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