In this paper, ULearn (University of Surrey learning on-line) and e-learning techniques are used to enhance the students' understanding and participation in Dynamics modules for an undergraduate programme in the School of Engineering, University of Surrey. The Dynamics modules are taught at Levels 2 and 3 and contain several mechanisms and vibrating systems. The modules consist of several chapters, each of which has its own folder, or content file, in ULearn. In addition to the discussion board and chat room, on-line simulations have been made available and integrated within ULearn. In order to evaluate students' understanding and encourage the student participation in ULearn, timed on-line assessments, in the form of multiple-choice quizzes, have been designed. The feedback of the students has indicated that the use of ULearn was of great help to improve their understanding of the Dynamics modules. (Contains 17 figures.)