In this unit the competencies required by a trainee in order to apply a wide range of Mechanical science principles in their work are addressed, while adhering to occupational safety and health procedures relevant to specific workplace. The following areas have been considered: determining forces in a system, demonstrating knowledge of moments, understanding friction principles, understanding motions in engineering, describing work, energy and power, performing machine calculations, demonstrating gas principles, applying heat knowledge, applying density knowledge and applying pressure principles.