The new 3rd SI editions of two of the most successful engineering texts ever published have undergone substantial change and revision. Ferdinand Beer and Russell Johnston have retained their clear writing style as well as the wealth of excellent problems and logical presentation of the theory. The accuracy of the theory, the problems and the artwork ensures that undergraduates will grasp the concepts essential for the remainder of their student and professional careers. The 3rd SI edition contains a new four-colour design, and the software that accompanies the text is completely new, containing interactive modules with animations of free-body diagrams, and quizzes to accompany every subject.