In machine design we usually compare the equivalent stress of the component with the: a) Allowable stress b) Machine stress c) Force d) Moment e) Torque

In dynamics, the friction force acting on a moving object is always A) in the direction of its motion. B) a kinetic friction. C) a static friction. D) zero.

11 and 12

Hooke's Law defines the stress-strain relationship for an elastic material: s=Ee, where E=                                . A)The strain of the material at yield B)The percent elongation at failure C) A constant neutralization reducing the units to zero D) a constant proportionality called the modulus of elasticity